I’ve learned around 3000 katakana words using this deck (total: 4469 words) on the platform Kitsun. If you don’t know Kitsun, it’s a SRS website developed by a (level 60) Wanikani user. If you want to check it out first, here’s the Kitsun’s thread on the forums:
You’ll need to sign up in order to be able to see/use the deck. Kitsun will go pay to use in a few months (currently getting a redesign + a bunch of new features), so there’s that to take into consideration.