Any advice at all would be appreciated, thanks!
I was astounded by the sloppiness of some of White’s moves, but on the whole it felt to me that Black played a bit too defensively, mostly in the sense of worrying about staying alive. Together with a major misplay in the southwest corner, this naturally led to a territorial lead for White.
By the way, nice job in playing an even game against a 2k. Because your mistakes are punished more reliably, these types of games help to give clearer hints about how to improve your game.