Have you had a look at the level pages, and which kanji come up each level? You can see at which point the material starts to become mew for you, and how long it would take to get there. If it seems an acceptable wait time, you can then start to build a routine with WK that wouldn’t take up too much of your time, but would keep the pace up. In the meantime, I would look into installing some scripts that can help with typos and such, if that is an issue for you. That will reduce frustration as you slog through well known material, but make needless mistakes. For example if you enter a previously learned meaning, that WK doesn’t (yet) accept, for some reason.
I like [Userscript]: Double-Check (Version 2.x), which comes complete with lightning mode, reducing the amount of time you spend on reviews.