Mac OS won’t boot; boot camp will.

When I start the iMac there’s a crossed out symbol for the Mac OS system and then it automatically switches to boot camp which works fine.

the crossed out symbol only started to appear after I force restarted it after the iMac was acting strange; it was getting slow and the OS wouldn’t even load and then one night it was awake all night even though it should have went to sleep like it would when it’s unused.

i initially tried to resinstall macOS on standard recovery mode and it would get up to a quarter but then fail (no logs)

i have tried using internet recovery and used disk utility I get The following error:

I have also tried cmd + s and it doesn’t work I get an error message (2nd pic)

i have tried reinstalling Mac OS on the internet recovery mode but it’s the same it would go to a quarter and then say it takes 7+ hours, 11 hours+ (I have logs for this).

Both Mac OS and boot camp are installed on same drive in different volumes/partition.