The usage of interest(ed) in and interest(ed) to was outlined by user Egghead99 in this helpful answer.
"Interested in" is used when what comes after it is a noun, or a verb acting like a noun (known as a gerund). [...] Therefore, this sentence usually takes the form "[Someone] is interested in [something]."
"Interested to" is used when what comes after it is a verb in its "to
form" (known as an infinitive). [...] This type of sentence usually takes the form of "[Someone] is interested [to do something]."
Interest(ed) towards, however, is a bit tricky. It has consistently been unpopular and rarely used throughout all periods, according to Ngram. Therefore, it is not by any measures colloquial. In the few cases where it was used, the word toward does not seem to accompany interest itself, but rather other constructions, such as direct (towards) and turned (towards). In one case, interest toward seem to have been used exclusively to avoid repetition. In some other cases, like this and this, interest(ed) towards is used in some situations where it is effectively interchangeable with interest(ed) in.
To sum it up, you are interested in something, interested to do something, but most likely won't be interested towards something.