I've been using an nfc card based thing called brick to add friction and halt doomscrolling.

Essentially I use my normal phone, but lock specific apps. To unlock those apps I must scan the nfc card I keep in my car. That means getting up and going outside.

That tiny bit of added friction has cut my screentime in half and made me more productive, and less stressed.

There are other devices like it now, for example Bloom.