6 added 204 characters in body
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I only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However

However, if we say "I am/was the only one who did this", it conveys the required sense.

Alternatively, you can say "I alone did this". According to Oxford Learner's Dictionary, "alone" can be used after a noun or pronoun to show that the person or thing mentioned is "the only one".

I only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "I am the only one who did this", it conveys the required sense.

I only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help.

However, if we say "I am/was the only one who did this", it conveys the required sense.

Alternatively, you can say "I alone did this". According to Oxford Learner's Dictionary, "alone" can be used after a noun or pronoun to show that the person or thing mentioned is "the only one".

5 deleted 2 characters in body
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UBII only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "I am the only one who did this", it conveys the required sense.

UBI only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "I am the only one who did this", it conveys the required sense.

I only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "I am the only one who did this", it conveys the required sense.

4 added 15 characters in body
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UBI only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "only I"I am the only one who did this", it conveys the required sense.

UBI only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "only I did this", it conveys the required sense.

UBI only did this.

I myself did this.

(The OP wants to convey the message that the job was done by him, not by anyone else).

I think neither of the sentences conveys the required message. The first sentence conveys the sense that I did this and not anyting else. In the second sentence, the reflexive pronoun "myself" has been used for emphasizing that I am referring to myself and not anybody else. In other words, it may mean that I personally did this.

I think even the sentence "I did this myself/by myself/on my own" doesn't convey the 0P's message because it means that I did this without anybody's help. However, if we say "I am the only one who did this", it conveys the required sense.

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