I suggest relearning Kanji as you read if you still remember Kanji somewhat – as at this point you should have enough Kanji to read. Kanji (readings and meanings) and vocabularies can easily exceed Wanikani, even for Wanikani Kanji. Lower level Kanji can easily be imagined how far they lack.
Resurrecting burned items is indeed an option.
[Userscript] Burn Manager (Review / Resurrect / Retire) Other items in SRS queue can let SRS evaluate your memory. Nonetheless, I don’t regret resetting, only that I am not exactly sure Wanikani is a good choice anymore.