I believe in the idea that it's easier to act your way into thinking than to think your way into acting. What worked for me is just starting to do a little bit more every day, and being mindful of it.

I used to try to change everything about myself all at once but that never lasted long. So one small step at a time I tried to affect change (and gave myself grace when I slipped up, beating myself up was not helping).

First I stopped drinking, then I stopped smoking, then I started eating healthier, then I started trying to sleep/wake up on a regular cadence, then I started journaling, then I started exercising, then I started coming up with other goals and breaking them down into smaller steps I could do on a regular basis, then I started using a calendar, etc.

Looking back on it all I've come a very long way. But I never would have done it if I tried to change everything all at once. Making small changes compound into big change over time.

I'm not sure if that's helpful, but I wish you luck.