I’ve been in a similar predicament :-) I deleted the app on my phone, it still gives me the option to look up insta on my laptop but it’s not available all the time for useless scrolling — which is the reason why I deleted it.
And on top of that there is an app called ScreenZen (I’m sure there are more) where you can limit your app usage (I have it set on 3 times a day for tumblr and reddit for example) and it’s working really well for me! Can only recommend!!