As boring as this answer may be, but the one thing that was most helpful for me, is meditation. I’m an atheist and I want to run away when I hear ambient yoga music and „soothing voices“ in guided meditation, so it took a while for me to find a good entry point that was suitable for me, but it improved my daily live significantly. I don’t do it every day (because I’m still human and I can’t call it a habit yet) but I know it would make my life better if I did.
Sidenote: I also tried to create a going to bed ritual with fancy face gels and face wash, but all it spawned was a lot of pimpels and a parfume smelling pillow. So I ditched that and have again no pimpels at all, now that I let my face do it’s thing and just wash it with water and some soap every now and then.
I’d be interested in other „going to bed rituals“ that you guys may have, as I like the idea to have this kind of ritual in general.