Did the Democrats take advantage in 2020? Of course they did. But they were motivated to vote. They hated Trump. Biden's ground game was superior (even if some of it was unethical).
The point is that we can't just blame it all on "fraud".
We have to go to each swing state like Arizona and Wisconsin and ban ballot harvesting. No mail in ballots. We have to do it now. If we contest it the day after the election, it's too late.