What small lifestyle changes have actually helped you feel better?

I've been trying to make some healthier changes to my daily routine, but I'm finding it difficult to know which changes are actually worth sticking with.

For people who have dealt with things like poor sleep, low energy, or general health issues, what simple changes made the biggest difference for you?

I'm especially interested in things that were realistic to maintain long term—not extreme diets or complicated routines.

Would love to hear what worked for you and what didn't.