You should spend a few hours turning the useless ones off, making the non-urgent ones silent, and filtering the important ones. For each notification, ask yourself "do I need to know this now?" If not, turn it off.

My phone only lets calls and instant messages through. Bank notifications are silent. Everything else is turned off.

Then filter email the same way. My inbox is a sacred space. It's similarly quiet.

It made a big difference for me. I get sidetracked a lot, and reducing interruptions and unnecessary information helped.

I wrote the exact steps I took here: https://nicolasbouliane.com/blog/silence