laziest way to learn japanese

Hey its just as it sounds, what is the laziest way to learn japanese just enough to pass n2. I don't have as much time as I did before, I do have a decent base rn I took ap japanese in highschool I got a 4, and its lowkey been a year or so since I've done any japanese practice though so I do need a pretty hard refresher on everything. I do watch anime time to time without subtitles but I don't really watch anime much anymore.

To give some context my goal is to be able to eventually read books in japanese. The books I wanna read the most is mushoku tensei cuz it is my fav LN, but I wanna be able to read books in general not just light novels. I also wanna be able to understand speech.

To summarize what is something I can do for 10-30 minutes a day to help me be fluent (well N2) in japanese in like 2-3(or longer I don't really care that much) years or so. What are things I can watch for entertainment that can help, is anime fine (I really don't watch anime anymore it was since softmore year of hs). Manga I really struggle because of the kanji. I do have wanikani for context

by kabyking