You may want to take a look at the thread 
Let’s Durtle the Scenic Route 
, where the whole idea is to take an approach to WaniKani where we avoid burnout by consciously taking our time – in other words, at our own sustainable and comfortable pace – so that we can always maintain the enjoyment of the process of learning Japanese.
I burned out a couple of years ago and when I came back, I had decided I needed to slow myself down. I was glad to find a little thread/group of like-minded folks who had similar thoughts and ideas about how to do so.