That’s a punishing number of apprentice items you’ve got.
I had a 1000+ review queue years ago and I ended up writing a user script to make it easy to get back on track:
I can understand that you don’t want to reset further and so something like this script (there’s also Wanikani Reorder Ultimate 2) would help you a lot. In your current situation, the chance of items coming back at ideal SRS intervals is so small that you’re basically just wasting your time using WK.