"Amateur" has some negative connotations (as another native speaker). It's often used an inferior comparison to "professional". Just search "amateur hour" to yield a stream of disparanging comments.

https://twitter.com/search?q=amateur%20hour&src=typed_query

I would definitely use "enthusiast" over "amateur" (or other variants, e.g. fan, fanatic, lover, or a label that's specific to in-group members of the genre, if one exists). I'd also suggest a-b testing all the things to end the speculation.