[Ads are a waste. No one watches them. The fast forward or go yo the bathroom.]
Reagan, who won 49 states and 525 electoral votes, ran tons of ads. He had more charisma and was generally liked by people on both sides of the aisle. You can still see some of his ads on Youtube. He was a master politician. He ran ads because he thought they worked.
We live in a different time, media is completely different. Tv ads are outdated forms of communication. This election was not about Biden having good ads. It was about 5 years of hate towards Trump. Not enough ads in the world for Trump to convince the haters otherwise.