To add on to what I wrote here-- what was missing from January 6th was a unified Republican stance that violence and 'cheating' were justified. The people who had already made up their minds about that charged into the capitol, and the Republicans in the halls of power turned tails and shat on them as a result, proving that they were more motivated more by a loyalty to the status quo than by a chance to reshape it through force.
That lack of unity is gone in 2024. Trump is the Party, and he has proven that he is willing to cheat and kill to keep himself on top.