Here's what I personally think in hindsight, was the crucial point; where I could have ended the game in a swift win.
Wild West Chess - Too Fast on the Draw!
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That position requires a cool mind, and with some calculation there is a mate in 2. Sac the rook in front of the King, and when his Bishop recaptures; observe how the Knight covers the only flight square.
Here's an article by GM Naroditsky on that particular situation.: https://www.chess.com/article/view/rooks-on-the-seventh-revisited
I think I lacked some Rooks on the 7th-knowledge there. I was fearing the repetition of 3 moves, but I couldn't see the mate.