I know I’m a hundred years too early to empathize with this, but I felt the same thing for a bit so I looked around for something to help me memorize those kanji that don’t stick.
I use this neat method shared by Leebo. I made my own custom sheet with space for vocabs too and practice everything that I feel I’ll have a hard time remembering. It’s boosted my average accuracy from like 80% to an easy 95%.