At the moment I already know ~80% of the items, so I just want to get through them as fast as possible. I use the self-study add-on to “pre-learn” the unknown kanji of next level(s):
When the next level comes up I am not slowed down by a few odd kanji. I don’t want to be stuck at 89% kanji completion for a few days because of a single kanji I know I can handle eventually.
I probably hit new territory soon so my strategy might change, but the userscript is also valuable to review for example all kanji of a single level in a few minutes.