there are many interesting breathing techniques, interestingly it usually provides benefits similar to a meditation practice.
I added this one to my routines:
https://routineshub.com/public/items/760bb353-35cc-483c-adce...
I also regularly practice Andrew Weil's 478 breathing https://routineshub.com/public/items/fb2c75bd-4d6d-424e-925a...