If you have a custom recovery (TWRP or OrangeFox) and your ROM allows that:Rebooted several times since then... Even used the command multiple times
How do I manually restart Google services? I cleared data and cache in settingsand rebooted but I don't know how to really "restart" it
When I open the apps that don't receive notifications (e. G. Gmail) I see the reason why I SHOULD have gotten a notification (e. G. An email). But the notification still doesn't pop up afterwards (delayed).
0. Do your backup before.
1. Dirty install your ROM (just flash the same ROM, without format or Wipes).
2. It will restore your ROM to stock settings.
3. Will be required flash, install and set Magisk/Modules again. Flash then after flash the ROM.
4. Maybe Magisk is enough to restore your modules, after boot check them on it.