I’ve fallen off the bandwagon a few times and accumulated 600+ reviews. After I let reviews build up too much, I personally prefer working through the backlog to get it down to zero (however many days that takes), and then resume hitting zero every day after that. When you’re hitting zero reviews multiple times every day your review accuracy will go up, then once your daily review load and apprentice count are easy to handle, you’ll be ready to do more lessons.
One time I did use a reorder script to get through a large backlogs of reviews. I set it to give me radicals first, then kanji, then vocab, and I worked on getting each of those down to zero only after I was successfully hitting zero with the previous one. Vocab was obviously a much larger batch than radicals or kanji, but the reorder script should also let you sort by other categories if you find it necessary.
Honestly that’s exactly what a lot of members here do/have done. I definitely consider 250+ a normal day’s workload when leveling. To make your daily load easier, you probably need to make sure you’re down to like 20 or less apprentice items before you do lessons, and not let the apprentice count go over 100.