I want to become a math monk. I’m a senior studying Physics, but I’ve never done any serious proof-based math course. I want to reach the highest heights possible. How do I go about this?

I took on the project of seriously self-studying philosophy for 2.5 years and all my peers and professors consider me tremendous at the subject and encyclopedic understanding. However, I found the canon defined and I was able to build momentum by starting with histories of the philosophies and reading x amount of pages every day until it became a habit and my knowledge exploded. That and my use of Anki and forcing myself to write essays.

I tell you this tale because I’m a little puzzled how to do this with math. I imagine starting with some problem book can help me get hooked into studying math seriously as a hobby. I’m using The Street Fighting Mathematics textbook now because it’s fairly short and useful, but I am not sure where to go from there. For a training regimen, am I just repeating problems and proofs? Appreciate any insights