What music, films and hobbies should I have that will be conducive to enhancing the capabilities of my brain?

I already religiously exercise multiple times a week to keep my brain fresh. I've played chess for a number of years but once I achieved a ~1950 blitz/bullet rating on Lichess I determined I was no longer really stimulating my brain much beyond memorizing algorithms from my games with the Stockfish engine.

I am seeking some activities that will improve my brain in the downtime when I am not producing new works to humanity.