One important thing to do is to never stop coming to Wanikani every day. Even if you can’t do new lessons, you should try to find time to maintain the knowledge you already have and keep up with the reviews. A good trick is figuring out beforehand when life will get busier and to stop doing lessons a few days before.
I also wrote a guide for Wanikani that will help you understand everything. I highly advise you to read it. It is definitely possible to get to the end, no worries
