My worst defeat on time
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There's a few lessons from this game, aside from tactical stuff.
By move 40 the game is a draw. 43. a4 would have cost you the game for violating the rule of opposition. Allowing the enemy king into the camp.
21. Bxc5? The bishop pair is an advantage if you can open up the position (exchange pawns), I wouldn't have taken the night.
32. Rxh7? This just reduces the pressure in blacks back ranks. Rde1 would be my preference as this would maintain pressure on the back ranks if black was to exchange rooks.