My phone on my end seems fine. Im getting every notification. The issue is that when people send me text messages it tells them that I have notifications silenced.
As far as focus modes- I have deleted them- didnt fix the problem- re-added them- didnt fix the problem so I deleted them again.
Have a little play with focus status, might do something. Also check you don’t have any times set up to come on automatically under do not disturb.
Failing that. Turn iMessage off and on.