Any, and I mean any "in case of a Git problem, just do this" recipe is wrong, often in very subtle ways. So, my advice: in case of a Git problem, contact the help channel provided by the organization hosting your Git repository. They'll help you out! And if it's your personal-I-am-truly-the-only-human-using-this repository? Just recreate it, and save yourself the pain.
Source: I'm part of the team behind the #githelp channel in many $DAYJOBs, and we know how hard things are. You committed an unencrypted password file, or worse, your entire 'secret' MP4 collection to our monorepo? Sure, just let us know! Pushed your experimental branch to master/main/head/whatever? We'll fix it!
Just don't ever, for whatever reason, run that-chain-of-commands you found on the Internet, without understanding what they do! In most cases, your initial mistake can be undone pretty quickly (despite requiring nonstandard tooling), but once you're three levels deep and four days later, not so much...