I understand that having ADHD would make this more diffcult, but I have found it helpful to use the feature on my phone (iOS, but presumably Android has similar) which limits the total amount of time I can use a particular app every day.

When the time limit is up, I can still keep using the app if I want to, but often that is a sufficient reminder ("I've already been using this app for an hour?!") that I can stop.

I appreciate this feature because I can enjoy the app but also still feel in control of my time.