You might want to give Bunpro a shot, it makes you type the answers in Japanese and I find it forces me to nail down exactly how to use a grammar point correctl

You might want to give Bunpro a shot, it makes you type the answers in Japanese and I find it forces me to nail down exactly how to use a grammar point correctly (it's also usually fairly good about accounting for situations where there are multiple correct answers, and will give you a hint and let you make another attempt if you're only slightly wrong).