He really, really tried. He threatened legal action, sent intimidation to the counties he thinks will "vote wrong," he tried to force mass disenfranchisement of political opponents, he pulled multiple "heads I win, tails you lose" legal arrangements for contested races, he has sown doubt about non-existent widespread election fraud, he tried to overturn an election, he pressures Georgia to "find him more votes," he constantly prosecutes his political opponents on bogus charges that never stick...
I could go on. Do you live under a rock? He's only not controlling this election because he failed. They badly wanted to rig things in their favor, forever. Project 2025.
Edit: oh, right, I left out offering bribes to vote in his favor and instructing state GOPs to gerrymander as hard as possible, while contesting blue states doing the same. Trump is a dictator, he's just bad at it.