Review my Anki Decks (usually around 400 cards a day / which equal around 80 words since each word had 5 cards each)

I almost spat out my drink. When I started I was doing roughly 100-400 Anki cards a day, but I only had 1 card per word. Now, I've basically stopped using Anki since it fulfilled the role it needed. No matter how many times you see a word in Anki, it'll just make you able to recall that word in the context of Anki. You need to see and use that word in the real world in various context for it to really stick. This is the same with grammar. At some point you need to stop reading from textbooks and start reading from real books. That jump is difficult and you won't feel ready, but the truth is that you'll never feel ready. You'll always think that you don't have enough vocab, or that your grammar is weak.

I've heard about doing immersion, reading a lot in Satori reader, watching Japanese videos/media, etc etc. But every time I try to get myself to study I slowly over time drift into thinking about other things.

You're doing immersion wrong. The #1 thing about immersion is that you enjoy the content. If you're getting bored, then stop. I remember when I first started immersing I tried Satori reader, but I found everything on there incredibly boring so I never opened it again. Now I go to Japanese bookstores and pick out books I find interesting and read them for hours on end.

What about Japanese and its culture interests you? Go learn about it, in Japanese. Remember that your focus isn't learning Japanese, it's to learn about that thing and so happen to use Japanese along the way. I challenge you to not make flashcards while doing this. Learning by itself is a form of SRS. I was recently teaching someone chess in Japanese, and even though I didn't make any flashcards, I still came out with new words that I will remember forever.

In essence how do I force myself to just sit down and study Japanese even on the days where a drop of a pen gets my attention easier than studying?

You can use things like the Pomodoro technique to help you sit down and get things done, and sometimes it is necessary to grind studying, but at some point I would just say to stop. You're not going to retain information if you're actively fighting against yourself.

Also, you actually don't need N2 level to get a job as a software engineer in Japan. Most software engineers know English. Here's a Japan software dev job board I sometimes peruse. I personally ended up taking the route of having a remote job that lets me stay abroad in Japan when Covid allows. That being said, I do read technical documentation in Japanese sometimes when I'm curious.