Deleted disk volume by mistake, cant re-install macOS
I have some issues with re-installing macOS after i managed to delete the internal Macintosh HD APFS volume by mistake.
I have recently bought a new Macbook, and was preparing my old Air for sale. I used Disk Utility in Recovery Mode, chose Macintosh HD, and hit Erase, just like the guide told me. Afterwards i was going to re-install Big Sur, but had problems with storage (needed about 7.4GB). I went back to Disk Utility, and noticed that the Macintosh HD had 85.16GB used for "Other Volumes". This is where i made the mistake, and pressed "-" in the toolbar to delete the volume.
After this my Mac obviously could not find a disk for installing macOS when went back to the installer. I tried adding a APFS volume by using "+" in the Disk Utility toolbar. This added a volume, which i can find in the installer, but I still need more space to install macOS, and "Other Volumes" still takes up 85.16GB.
When I try to start my Macbook now it only shows an Error, but i can still access Recovery Mode.
How do I free up enough space to re-install a macOS, and how can I get my Macbook up running again?
MacBook Air 13″, macOS 11.2