Your phone should still be getting updates.
My guess would be a region issue. Phones are made for certain countries. If a phone is moved to a new country, updates usually break.
So you not having updates probably means your phone was originally from another country.
To check, settings, about phone, software information, send a screenshot of "service provider software information". That should let me work out the country.
There is a sorta fix, but I want to make sure that is actually the issue before I suggest fixes