Reading is much better for learning about this kind of thing that watching youtube.
https://www.amazon.ca/Brute-Force-John-Ellis/dp/0670807737The RAF was never nearly defeated at any point in the BOB. And lined up behind them was a navy that had to be dealt with somehow after the Germans had thrown away their own small surface forces in Norway.
When you take the numbers presented in Brute Force, and the intelligence advantages the allies east and west had and throw in that he Germans demonstrated very clearly what would happen to anyone they defeated.
All that was needed was the willingness to fight them.
The allies had dozens and dozens of painful but certain ways to beat the Germans, the Germans had only the hope that they would not be fully opposed. And their own actions ensured they would be fully opposed.
The rest is just romanticism.