Where can I learn advanced music theory?

I already have a pretty good knowledge of music theory. I know how to build chords, scales, I know which chords go in each key, I know about chromatic chords, the seven elements of music, counterpoint, music analysis, secondary dominants, how to compose starting from a melody... basically anything you can find looking for "advanced music theory" on google I know it.

I want to go beyond that, though. Other than attending a school for it, where can I look to expand my knowledge?

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