Not sure how if it’s anywhere near what you’re after but my current grammar strategy is making anki cards from the sample sentences of the N3-N1 nihongo no mori videos.
I watch the video, and make a card with the sentence, definition of the grammar point and if needed I try to transcribe any explanations particular to a certain sentences if I don’t find it obvious.
Because I’m a sucker for doing tons of work (and because I find that audio tends to stick in my brain better) I’ve also taken it upon myself to add the audio from the youtube video… I guess all this work does serve to drill the stuff though.
So far I’ve found this to stick way better than other methods I’ve tried. Especially since this way, by the time the stuff is in anki, I’m drilling stuff I’ve already had properly explained.