Technically he can't run again so he doesn't need any money for his own campaign. However, he might reward donations to his friends in the MAGA Cinematic Universe.
The US constitution would allow him to "run" ( usually it's coast ) as Vice President to the next POTUS .. and that would also allow him one day less than two years as POTUS should the VP be required to take over for the sitting President.
Realistically Trump most likely lacks any interest once his various and sundry pending felony and other charges have been quashed or voided by immunity grants, etc.
I can't say for certain, I'm Australian and don't work with the US political admin (ie no inside line) but there's certainly been US insiders that have strongly hinted dodging massive mounting legal trouble was a major motivation for Trump to run again.
To be clear they may have been deadly serious, seriously joking, or both at the same time .. it's just that good a fit as a theory.
If he were to do a Medvedev/Putin-style ticket, the least he could do by way of acknowledgement would be to have his loyal "President" get filmed dancing to Kombinatsiya's "Russian Girls" (1989).
> If he runs it will be by ignoring the Constitution
He's already done that—section 3 of the 14th amendment should have prohibited him from becoming president. It went to the Supreme Court, and they decided they didn't care. If the 14th amendment could be ignored, why not the 22nd?
They have one path for political redemption, and it’s to acquire Trump annd his allies’ companies and/or invest in their funds.