This was the longest game I have ever played
Also, take a careful look at positions like this one after black's 21st move, Rde8:

Do you see that big green arrow pointing at your bishop? There are two attackers and two defenders. However, those two defenders are your queen and your king, meaning that if black takes your bishop, you are going to have to give up your queen to get two rooks for your bishop and queen.
Worse yet, one of those defenders, your queen, is overworked. It has to defend the bishop on e2 and also the rook on c1 (which is attacked by your opponent's queen.)
Your move, Qe1, was a terrible blunder and could have cost you the game. It didn't add any defenders to the bishop, which you could have moved away. Instead, it moved your queen into a pin.
If your opponent had played Rxe2, what would you have done? If you take back on e2, you not only lose your queen to Rxe2, you have left your rook on c1 undefended.
It would have been game over. If you look at the computer evaluation, it suggests a3 as the best move after Rxe2. That move effectively admits there would have been nothing that you could do.
You need to play through that position to understand why moving your queen to e1 was such a terrible move.