I don't receive notifications from apps

I stopped receiving notifications from some apps. They started working after I uninstalled and reinstalled apps, but I don't want to do that every time. And now notifications from the standard messaging application do not come, it cannot be deleted. I only see a red circle with the number of posts, but there is no banner at the top of the screen. Focusing is not enabled, settings have not been changed. How to solve this problem? It is very important.