disk utility failed

Get a friend to let you use their mac for a bit, download the relevant installer, and make a bootable installer on a thumb drive.

Use that on your mac to completely erase the whole internal drive, and install a fresh system.

I hope you have a backup.

To download a copy of the OS:

https://support.apple.com/en-us/HT211683

To create a bootable installer:

https://support.apple.com/en-us/HT201372

In Recovery OS, click on Utilities -> Terminal. You should be able to erase the whole disk using diskutil commands. Once you have, Recovery OS should allow installation of a suitable macOS version.