Something I’ve been considering for myself recently and I’ve seen recommended by others a lot (seeing as I’m now averaging 250 reviews a day and am about to go back to college) is to finish your current level at your usual pace (for me, basically as fast as possible and keeping track of which specific reviews I need to finish at the hour I get them and keeping track of which sets I can do at a a bit slower a pace) and then level up. But before doing any lessons for the new level, just hang out doing reviews for a while until you’ve got your apprentice pile down a bit.
Most people try for under 100. The items in your apprentice box are the majority of your daily reviews, whether that be old ones that you get wrong and pop up again, or kanji and vocab from your current level. If you can get older ones up to guru or even master, then your number of daily reviews will drastically decrease.
The reason I’m hesitant about doing that is because I’m really trying to get WaniKani done by the end of my first year of college and have been trying to get my average time per level down from the 12-14 days they were taking me for like the first 15 levels before I kinda figured out a system. But like someone above me stated, it’s learning a language, not playing a game. We’re not going for a high score, and in the end, the main impact we’re talking about is adding another few days, maybe a week or two, to our total time every time we take a break from lessons. So not that big a deal. If reviews are starting to pile up, it’s probably a good idea.
Another thing I’ve found that helps me a lot with those confusing recurring kanji vocab that I just get wrong over and over again, usually because I repeatedly confuse it with something else that looks similar or uses a similar mnemonic or logic behind the vocab, is I have a tab in my notes app that clarifies things. When I come across one of those items that I’m always confusing, I guess, then whether I get it wrong or right, I throw it in the notes app alongside the other one I confuse it with and take a good look at the difference, or sometimes make a mnemonic for it.
For instance, I was always confusing 存 (そん) and 在 (ざい) because I could never remember what radical the actual difference was. When I wrote them down side by side, I could remember that 存 has the 子 radical in it, who is my son (そん). Things like that. I’ve got like 30 some distinctions on that app, and it helps a lot. Usually just writing them down side by side is enough and I never have to look at it again, but it’s good to save in case I forget.
Anyway, hope this helps!