I think it’s literally a Grammerly addon (but I’m not OP)

I’d be interested in one for LanguageTool instead

No problem. Don’t forget to try and do a test before nuking the original data, especially if you can’t find a guide online!

While I don’t know about lutris specifically, usually the easier strategy is to have your home folder as its own partition and map the new install into your old home folder. Then, once you install your programs again (lutris), it all just maps up properly like you never changed os’.

If you wanted a smaller version of that, backup your lutris configuration and install directories and restore them (in the exact same place) on the new install.