Cheat, in the worst kind of way—Full god mode, BFG with unlimited ammo, etc. That can ruin a game pretty easily when there’s no challenge and the story might not be new or interesting. Might lead to boredom and wanting to do something else.
Play games you don’t like much and can only stand to play in small increments.
Play casual, relaxing games like Dorfromantik that you can quit playing easily after a round or two.
Get into game design. Make your own game so you’re creating something that you can share with others. It’s still related to your gaming interests, but could be more productive.
Make friends with someone or a group of people who have a different hobby in common so you have a reason to socialize that doesn’t drag you back to playing games.
Make a bucket list and start pursuing one of the items on the list like writing a novel or painting a landscape or building something practical.
Set time limits for your gaming and force yourself to do something else that doesn’t allow for gaming, even something simple like taking a walk without a gaming device. Make gaming a reward for being responsible rather than an addictive obligation. Focus on learning to appreciate delayed gratification.