It doesn't work that way. Money has already been budgeted and spent. Appointees have already been confirmed. Trump's term already ended. If by some incredible miracle he is restored, he would have undo what Biden did on his own.
“he would have undo what Biden did on his own.”
Wrong.
Quo Warranto (look it up)
https://code.dccouncil.us/dc/council/code/titles/16/chapters/35/