I think one of the best ways to do it is looking for the next day section in the frontpage of wanikani. As long as you’re doing more itens than the next day pile, eventually, you’ll zero out your reviews.
There’s not much to it except grinding it out. I personally can’t forget that there’s a pile to be finished whenever I skip reviews for two or three days. It works for me. Give yourself some prizes for reaching milestones, like “If I get to finish 1 thousand reviews in 4 days, I’ll go out and have a drink with my friends.”
I don’t man, make the grind worth it. Think that, it’s your Japanese Education. It’s not like a teacher or a boss will punish you if you don’t make progress at this task. You’re the only one that is concerned in this matter and how you deal with it is a matter of personal responsability.
I wish you best of luck in your zeroing efforts!
P.S.: There’s a thread called like “the 0-review challenge” or something. Go there. you can find more tips or motivation from the comunity and, eventually, get that sweet sweet donut shaped number on your review count. <3