I would like to spend my time more on gaining a mental model of the projects I work on, but I get very demotivated if I start disliking things like the programming language, certain arch. Choices or anything that gets too complex that doesn't seem like its worth my time

It's heavily dependent on the project, but I feel like working as a "fullstack dev" kind of removes the fun of programming. I'm already spending 40 hrs a week looking at the most dull project I can imagine