After a long break

A break from Kanji-studying itself can break accuracy as well (depending on how good your language usage / immersion is).

Nonetheless, it might still be a good idea to test first whether you need reordering to clear the review pile.

I actually cleared review piles in the past, by reordering by levels (lower first), and reviewing only partially at a time (so, I don’t care if there are still too many remaining) – and now it is already experimentally built-in to WaniKani, so maybe no need for scripts.

It also depends on the device you do the review. Are you using a third-party mobile app? The scripts are desktop-focused; but mobile apps may already have the features built-in.