After I took a break last year between June and September because I started an apprenticeship, I continued with learning only to find myself being able to spend far less time on Wanikani.
After a few weeks, I ended up with about 1300 reviews piled up. At that point, the number of reviews I could handle and the amount of them appearing evened out.
Since then I have been trying to chip away at this mountain of reviews day after day.
Thankfully they are slowly decreasing, with me now being at this point:
I manage to get into the 700s after each review session with my last goal of always starting at under 900 being reached yesterday.
Now on towards getting in the 600s!