My suggestion is to be mindful of things you are doing and make decisions about continuing them or ending them and plan accordingly. I tend to recommend reading up on Stoicism as it help contextualize.

A more specific plan is to pick one thing you want to improve and practice that. Try and do this once a day and make it a habit. After you’ve adopted a couple of good habits, you’ll be ready to try stopping something, thought that is tougher to achieve.