You can use the reorder script to start with the older lessons (hoping that that are Kanji you know better with longer intervals between them).
There are lot’s of thread on the forum about it. You could also read them to see what others wrote there.
For example:
https://community.wanikani.com/t/3739-review-avalanche-of-death/45226/8
Also why do people never use the vacation mode when they are busy? I thought it is mentioned in the introduction in the first levels?
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