Since he was aquitted, Trump can run for Congress in his new home state of Florida in 2022. If he wins, and the GOP secures the House, he then could be confirmed to be speaker of the House.
Then, Speaker Trump's first act could be issuing articles of impeachment against both Joe and Kamala. If he gets them both out, he gets to finish their term for them as part of the line of succession.
Then, after his term is up in 2024, he can run for President again.