Forever loading (spinning wheel) after login. Nothing works!

Hi,

I had some issues with iMac (late 2017) - finder freezing, when I started download something in Safari, Safari crashed. Opera or any other browser crashed when opening and so on..). I decided to upgrade macOS from Mojave to Catalina.

When it was done, loggin screen appered, I put my pass, but there is spinning wheel + “beach ball” wheel rotating forever (Iwas waiting 6 hours cca)-

I tried safe mode (same issue), I tried nvram reset, I tried reinstall the OS second time via disk utility, I treid repair my drive via desk utility (no issues there), I read million articles to find out how to fix that, but nothing helps. Every reccomended step nd nothing works :(

I dont want to lose my data. Even apple service is not in my city...

Thanks for every help.