Ah sorry if I confused you!
More specifically I meant it’s important to clear your lesson queue before each level up, otherwise things can really start to pile up (happened to me once, was not fun )
Pretty much what @GrumpyPanda said, it’s especially important to be careful if you’re using something like the reorder script to prioritize the current level’s radicals and kanji to maximize level ups, this will leave you with only vocab lessons left, and it can add up if you’re not making sure to clear your queues. Every level up you’ll unlock some of the previous level’s vocab along with the current, new level’s radical/kanji/vocab so that’s fine, but still having vocab from 2+ levels ago can kick you in the butt overtime and put you at a risk of burnout
TL;DR you should be burning the turtles, not letting the turtles burn you
Also, the 0/0 streak challenge thread is a fun way to keep yourself accountable for clearing your queues for each current level so check that out if you’re interested/haven’t already ^^