A strategy is nothing without emotional control. To be profitable, you need nerves of steel when the market gets volatile and that’s the hardest part to master.
I agree with you that the most difficult thing in trading is not creating a strategy but rather managing and controlling oneself and one's emotions. A strategy can develop naturally as knowledge increases, but self-control is a matter of habit and awareness of the risks involved. It's pointless to have a good strategy if you don't have good risk management, because in the end, your profits will be lost.