Trump got 63 million votes in 2016. He got 7 million more in 2020. In the end, what decided the election is 3 votes every 100. The result is clear-cut: one wins, the other loses. But in reality what decided the election is a really tiny difference. Small enough for ads (from all sides) to have an effect on it, and really too small to say that anything has actually changed in the country.