Do not disturb mode (almost default).

Maybe allow repeated calls or let just important people get trough (your closest circle or people who you know will only call you for emergencies).

Notification indicators for objectives only (eg: work).

If you own a watch, phone in a different room and you'll get just important notifications if they arise.

Customize to your liking but your liking may be better being no notifications at all.

@martin_gwd