He can only create a "fundraising effort" to donate to if the Trumps are directors. (Trump doesn't let others control his grift money).Honestly, he will just announce a fundraising effort for the mid-terms almost immediately where he will siphon funds as a spotter's fee. He will try to maintain the 'kiss the ring' methodology for primaries for candidates - though GOP leadership will wean themselves off him as quickly as they can to position someone for 2028.
Last time he was president, the GOP House and Senate completely ignored him while he moaned about funding the wall. A few who want jobs from the House suck-up for a Secretary job, or to boost their Presidential hopes. But once those roles are doled out in the first few months, they just started ignoring him.
They'll do one big tax cut for the rich with a bunch of cuts which will be watered down. The debt will grow and they'll all not care and wait until there's a Democrat in charge before they care about debt again.
Apart from all the poor Americans who will suffer and die (but half of them voted for this), I'm only really worried about the stupid stuff Trump will do like starting wars and tariffs which affect some poor factory worker in Mexico or farmer in Gippsland. It's one thing for Trump to make his own idiot voters suffer, it's another to inflict that on others in the world and for nobody's real benefit.