

Before getting banned it’s probably a good idea to remove or replace all of your posts and comments with something like https://redact.dev/services/reddit
Reddit monetizes the content that users create so remove that content. The admins probably have tools to restore deleted comments and posts but that takes effort and time and if enough time goes by data and backups get lost.
If it’s going to grub rescue then that’s before it can even get to the grub menu (thus no kernel line at this point). It’s usually easiest to boot to live/rescue ISO and reinstall grub. Sometimes you can manually load grub modules from lib to manually boot from the grub rescue shell to the normal grub shell, but that’s more advanced.