Try something that keeps your hands busy but doesn't require complicated decisions - like playing with water and plants, watering, repotting, arranging leaves. Sounds basic but your brain really does switch off when you're doing repetitive motions and seeing results right away. You don't need anything expensive, or even many plants; a few will do, maybe some cuttings from ones you already have.
The thing is it's not "performative" like other hobbies - you're not trying to be good at anything, you're not comparing yourself to anyone, you're just existing alongside something that's growing. And when you get home stressed, even just 15-20 minutes of this kind of activity calms you down quite a bit. It works even better if you do it in silence or with some background music, without your phone in your hand.
A lot of people don't think about it, but just wandering around without a destination, even just around your neighborhood, is killer for switching off. It's not a sport, it's not competitive, nobody's watching you. Your mind just wanders and that's it.