Find a hobby to do on the side that you can use, maybe something with progression so you have something to focus on and track progress to keep you wanting to do that and not just stick to playing games. Something like drawing, learning an instrument, maybe even exercise, whether it be standard gym stuff or something else like skating or bouldering. If you still want to stick around a computer for whatever reason, maybe learn to code? Having a creative outlet will help loads to keep you from games if you have troubles endlessly playing them because you start getting the creative itches that makes you want to get something done related to that hobby, instead of just procrastinating.