There's a lot of garbage content on instagram, but a lot of good content and legitimately good photographers on there too.
The thing about IG is that the experience molds itself around how you engage...so its sort of garbage in, garbage out...quality in, quality out. So if you engage haphazardly to try to maximize likes, you'll end up following and engaging in a lot of garbage accounts...and your feed and experience is cluttered with garbage. I used to follow-back everyone who followed me, and doing that led to me getting littered with garbage content and spam.
Once I culled the accounts I follow and became more selective in who I engage with, I found that the experience is now more centered around quality content....with a touch of Disney magic (I get tagged a lot by that cosplay company I shoot for lol)