What worked for me in a long run speedrun is switching starts every 2-3 weeks.
I was looking for one that will work forever but always was getting busted the most from the first week of it.
The thing I’ve noticed is that provably srs is not sutable to spend more then 30 minutes per day, and if it’s me every to study 5-6 hours it should be very divers to make brain work, make it engaged with what you are doing, make produce those new neurons.
So maybe if you feel like a lemon after 2 weeks you can just switch resources and methods you use before it help ends to make everything new to you brain so it will work better.
At least it’s what I’m adapting as my meta for further learning into anything.
There are so many ways of studying you can adopt and juggle, try, maybe free recall, mnemonics, mind maps, trying to play with words it’s kanji, finding mnemonics.
One thing patiulcary good for grammar is just to create your own sentences or better essays, it’s a strait way to eliminate most grammar errors.
This is nice: https://youtu.be/6EZ8rN5NJXw?feature=shared
Just some stuff I think about lately, hope something will be useful even if the structure of this massage is tether mess
And anyhow good luck in your Japanese learning journey, I hope you’ll enjoy it!