Is there a good alternative for "passion" in "my passion in certain subject was ignited"? I have used the word "passion" just a few sentences ahead in the same article "my passion for certain subject is noteworthy". Thanks!
I personally prefer either my dedication or my commitment.
As for the further question in a comment: "my commitment/dedication in some subject is noteworthy," but not "my commitment/dedication in some subject is ignited"? I think you should use
... my commitment/dedication to some subject is noteworthy.
I believe that you can say something ignited my passion .... However, if you are talking about something that got your intention and brought you into the field for the first time, using piqued my interest might sound better. For example,
While I was researching into the field privately, I found a great article from your university that piqued my interest in learning more about the field. ...
You can even add pursue my passion, if you prefer, e.g.
... and I have pursued my passion ever since.
They're not exactly synonyms, but they may still be appropriate given the context:
commitment (to) (hat tip:@Damkerng)