There is also the theory that the British just had more practice at gunnery and sailhandling while blockading the French/Spanish in the various ports.
The rest is history podcast have a three parter on the battle of Trafalgar, they cover a lot of the lead up and essentially it sounds like the Royal Navy professionalised in a way that the the French and Spanish didn’t. Portsmouth was very industrialised to constantly develop and churn out naval assets and improvements. Coupled with the kings use of new financial methods and that 25% of the country’s GDP was spent on the navy you had basically an unbeatable force by the time Trafalgar happened.