First and foremost I want to thank you for a great post. I love these kinds of posts and questions. It surely does make one evaluate where they are and where they'd like to be.
With that said, I think I am pretty much in the same spot as you. I recently came back to the tables and decided to study poker in depth. I used to think of myself as an average player but in reality I was nowhere near an average player. I had my style but I knew nothing about odds
, stats, bankrolls, etc (you name it). Somehow in the past couple of months I got fascinated with the game (again!) but this time on a different level. I not only want to play poker but I want to know everything there is about it and I certainly would like to improve my game.
So, coming back to the original question, I think I see myself being able to play higher stakes online tournaments involving not only NLHE but a variety of poker flavors. Yes, I'm also enjoying other flavors like Omaha, 2-7, Stud or even Badugi. Nevertheless I will always favor NL Holdem.
Anyhow, good luck in your journey and I'm sure we'll get back to this topic (thread) a year from now to see how we did.