A notification is someone else requesting control of your next few seconds.

Each alert is a claim on your attention filed by someone who is not you and does not know what you were doing. Individually trivial, collectively they mean your day is being scheduled by a queue of other people’s priorities arriving in whatever order they were sent.

Go through your settings and turn off everything that is not a human being who needs you. It takes fifteen minutes and it is the single highest-return adjustment most people can make. The things you turned off will still be there when you choose to look.