On a quick glance, I like 38..Be5+ (because it instantly kicks the king back, keeps it out of your queen side's dark squares (except for a couple) for the rest of the game where your majority is so you can create a passer and win with the help of your king.) If you could promote the rook pawn, its promotion/queening square is dark so is also protected by your dark square bishop.
Thoughts?
I don't think there was a way to win this?
Could I have done better?
Quite pleased with a draw against a 1840, though..