With all those scripts you might need to turn on script compatibility mode in WK settings.
I posted about this a little while back, but I recently came back to WK after many years and it was showing over 2000 days since my last level up lol. I only had half the reviews you did, but it actually didn’t take as long to catch back up as I thought.
I’d recommend doing chunks of your reviews and paying close attention to the ones you fail. Double check the mnemonics, and if you forgot the kanji/radicals, take a look at those entries again as a quick refresher. I found that I remembered most things, although I had to use the double check script heavily because I forgot the exact terms WK uses. Most things I didn’t remember came back pretty quick after checking over the related kanji entries.