Turning stuff off isn't easy when there are so many different sources for them. I want to have important notifications that I write down myself, but turning off

Turning stuff off isn't easy when there are so many different sources for them. I want to have important notifications that I write down myself, but turning off all the other notifications has broken that for me. I get a 50-50 whether a given notification that I wrote myself will actually work for me. And all because I tried turning off notifications for things that I don't ever want to see a notification from.