I also went through the same thing before I had reset to level 11. It’s good that you have realized the mistake of this and were able to get through that obstacle without the need to reset. It’s not easy.
As for the 0 / 0 challenge (for anyone reading): Although it is a big task to 0 / 0 the first few times, its gets easier later on if you keep at it. Best of all, you will feel accomplished by doing so. At least I do. Honestly, WaniKani has become more fun due to the challenge. The topic itself is also very motivating. Seeing all the people stepping up to meet the challenge, checking in for every level. It’s a topic full of positive vibe. Hope to see ya all there.