Hey, I don’t think that I can answer your question well, but there already were tons of threads about resetting and coming back to WaniKani. I’ll give you some links:
To reset or not to reset?
After a long absence, I reset (to level 7), and I’m glad I did
How many times have you reset your level?
Help! Thinking of resetting 
There are more, just use the search button 
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