Alright, I created new databases. I deleted all the old folders. Then, put in all the new stuff. The only thing I think I forgot to delete were some of the files in the home directory.
But honestly, I can’t even figure out how MT managed to revert me back to January 30th, yet again! And all the old side navigation bars showed up! I mean, the whole left column reappears, along with the old bio. I don’t even know where that fucking data comes from!