Best resource to drill grammar?

I’ve been self learning Japanese for the past 3 months, I have read through genki 1 and am working through the work book and I am going through Italki lessons to practice speaking and listening. For kanji and tango vocab I use Anki, and in the past I did level 1 of LingoDeer but I didn’t find I retained much very well, although going through both LingoDeer and Genki on a topic made it pretty firm in my head.

My monthly subscription to LingoDeer and I’m not sure if it’s worth continuing. I would be more interested in it if it was the same lessons as Genki, but it’s not really aligned very often, and I dislike their review system as it’s mostly multiple choice or repeating sentences I learned the first time. It’s not bad but it’s not cheap and I’m wondering if there’s something better.

I really want a new app to try to drill grammar as I feel I understand it in the moment but may forget it a week later, and I enjoy the seratonin hit of completing grammar on an app. I’m trying the free month of bunpro right now, but I’m not super into it right off the bat as I felt I learned more vocab doing LingoDeer which is helpful.

Does anyone have recommendations for apps to use or a better way to improve my grammar? Is LingoDeer worth the high cost these days or even just a few more months ?