Reset mac -- can't reinstall macOS So after updating to Big Sur a lot of problems hit my mac all at once and I decided to roll it back. Since I didn't make a backup (dumb move I know) I had to basically start from scratch. Before I did so I backed up my current state to an external ssd and then erased the mac via recovery mode. Now its in recovery mode and the reinstall macOS keeps giving me an error and I can't restore from the Time Machine backup as it starts looking for the SSD but never finds it. I would like to try and get it running mojave or catalina or at least anything because in its current state it's useless
Macbook pro 2016
500GB SSD
Yes. Be sure you erased the entire drive from recovery. Some people erase only a volume and get stuck, the entire drive should be erased for your downgrade to work the fastest.
Which of these keys are you using?

https://support.apple.com/en-us/HT204904

For your case, you want Shift-Option-⌘-R

Reinstall the macOS that came with your Mac, or the closest version still available.