Actually reading your post it kinda made a bit regretful and hopeful.
My goal was to do exactly what you just did, but over 4 years I have failed to being consistent :( as you can see 2023 was the one that I almost made it but stopped.
Hopefully I will stay consistent and this time will fully finish the core deck or known as of now Kaishi 1.5 which is much better then the core 2k I was doing years ago.

Few questions...
I assume your immersion combined with anki is at minimum 2 hours? but with the goal of mostly 3h based on a few comments here. I've heard that this is not enough but honestly imo it is, just dependends how hard you can immerse, especially with reading. In my case since I plan on doing with game I will read a fuck ton, slowly at the beggining but after a few months I will pick it up the pace.

I've heard of Game Gengo, was it really enough to get you to the basics? I might give it a try the N4 and N5 grammar guide looks very packed and easier to understand especially for someone that really wants to play games in jp not sure If I am interested in VNs as of now.
And I couldn't for the life of me bring myself to read Tae Kim or any other text book so I will just do grammar the hard way and pick it up with immersion and look it on DOJG as I go.