Level 2 and 3 were my longest levels by far, actually. Click this to see what my chart looks like so far:
If you are new to Japanese, learning kanji and vocab can be very confusing and overwhelming at first! But as others have said, you’d be surprised at how much your brain really is capable of learning. I started at a very slow, irregular pace, then tried doing 10 lessons a day (this is when my level-up speed started to pick up), and when I realized I could handle that, I upped it slightly to 12-13 lessons a day, which is where I’ve pretty much stabilized with WK.
I have also added Anki lessons on the side, though I didn’t start out doing that, and only really this year have I been adding as many as I have been. Now I often learn 19 vocab words + 3 kanji a day across both platforms (WK and Anki). Could I have done this when I first started? Absolutely not! But my knowledge eventually got to a point where I had a strong enough base to work from, so learning new words/kanji wasn’t as difficult for me, and I was able to take on more work without taking on additional stress.
If you have better luck learning vocab and then kanji, then it might be that you’re better off investing more of your energy at this point into vocabulary acquisition, and letting your WK pace lag a little behind. I’m the exact opposite, haha, and find vocab way, way easier to learn if I know the kanji, so it’s more valuable for me to keep up a steady WK pace.
If you do want to improve your WK pace, I recommend checking out the ultimate guide to WK if you haven’t already read it. The tips in there are very useful even if you aren’t trying to speedrun WK.
One strategy that I have personally found useful is using the lesson filter script to distribute the kanji lessons throughout the level. I do 3 kanji and 9 vocab lessons a day, for example (if you keep a roughly 1:3 ratio of kanji to vocab, you shouldn’t get too far ahead with either one of them). I’ve found that it’s way easier for me to learn kanji in smaller batches, and it’s also less demoralizing for me if I can get started on new kanji right away when I level up instead of having to get through a pile of vocab lessons first. Perhaps trying something like this could work for you as well?