@lazar I mean, by now it's clear that you're trying to find excitement in life at work. Or in other words, the excitement in life for you is in exploring intellectual stuff. I agree with your assessment that you could be bored again in 2-3 years. Infact I will guarantee you that you'll be bored in 5 years if not 2-3. How can I guarantee? Because I'm the exact same.
What I would recommend is, talking to people who've overcome to problem.
Trying to find the juice of life at work is just a miserable approach.
Now that you've figured out making money and living comfortably, it's time you really started figuring out what is it that will truly satisfy you.
P.s: I know I sound like some spiritual/philosophical guy, but it's true. If you don't really think about this, you will become insanely frustrated. I have been there so I know