I get that it’s more about turnout than conversion but are there many Trump supporters that didn’t vote for him last time?

My impression at the time was that Trump did a very good job of energizing his base and getting the vote out. Are there actually many people that were indifferent/too lazy/too busy in 2020 but now think Trump is a good candidate? Is that fraction of the population actually larger than the fraction of people that now see him as a lethal threat to what’s left of democracy in America?

Has gerrymandering gotten worse somehow?