I agree with @DerRittmeister and @Pluckabee that you’re probably best off limiting how fast you do lessons. I tend to try to level up quickly, so here’s how I do that while keeping things from piling up too much. Note that this is only really possible since Wanikani started giving you lessons in level order. I guess I could have used a script before, but I never tried it.
- When I level up, as soon as I’m able, I do the lessons for the remaining vocab from the last level and the lessons for the new radicals, then I stop.
- I do reviews only for a day or a day and a half, then do the lessons for the first kanji in the new level.
- After that’s sat for another day or so, I’ll do all the remaining lessons, which are just the first vocab for the new level.
- At this point, the radicals and kanji will start to move up to guru in a naturally staggered sort of way, and I’ll do the resulting new lessons as they come up.
This method doesn’t reduce your average review load over, say, a week, but it does help to spread reviews out more evenly, so you don’t have a ton at once and then nothing for a while. I also expect this method will stop working in the late 40’s, but I’ll deal with that when I get there.