MAGA didn't win with money. The democrats spent far more. They won with a message.
Even if you could account for all the dark money, that still leaves you with leveraging soft power - e.g. Musk using X as a de facto propaganda arm of the Republican party, which doesn't show up on any books.
Musk and X propaganda helped. Also Rogan and other podcasters, but look at how much propaganda the democrat side has/had. All the major media outlets. Reddit, etc etc. Plus the power of the federal government in censorship, courts and the like.
Look, I don't really care and don't trust anyone running for office much. I'm just pointing out what a winning platform would look like. MAGA won because they were speaking to things that more people found important. When the Democrats figure this out, they will be in the winning seat again. If they don't, then they will not win.
Republicans have always been and continue to be pro-elite, pro-oligarchy, and against the economic interests anyone outside the upper class. They still have a better message than the democrats at the moment.