I actually just "ignore" phone notifications.
At any given moment, there's a dozen of them on my phone, and if a new one pop-up, I just let it stay there with the rest.
I disabled all useless notification and now on my lock screen I only see things I need to process.
I get message from someone that I don't want to reply right away? I just leave that notification on screen.
All reminders, mails and various other notifications (my washing machine pings me when its done) stay on my screen until I do what needs to be done.
This together with using trello as personal scrum board really helped me todo more.
Most apps have too many events to be worth notifications. Looking at you Slack. Those are better handled by a periodic polling rather than push notifications.
My phone notifications were useless until I did the same.
Deny notification access by default and "poll" your inbox/chats/etc with a calendar reminder 1, 3, or 5 times per day.