A heatmap that shows a past reviews day by day would be really motivating IMO. I mean something like you find on the stats page of Bunpro or like this extension for Anki: 
I’ve found this type of heatmap tool to add another layer of fun motivation to doing daily reviews.
Thanks to anyone who can help with this.
I made a similar post requesting this here also btw:
https://community.wanikani.com/t/review-heatmap-script/