I think the only solution was also the craziest/most risky and the party would have never gone for it.
Hold an open primary with a candidate that talks in no uncertain terms about the failures of the Biden presidency, and the new path forward, criticizing the Biden admin for not doing enough on inflation.
I think essentially Trump won in 2016 and 2024 because he was willing to take such a risk against political norms, and this was a change election. No explaining the causes of inflation, or what Biden did right and incremental steps were going to change that. People wanted a visionary leader, and while I disagree with Trump, I think Trump and Musk provided that new vision for America.
I hate this by the way, I'm an incrementalist policy wonk who in general hates visionary leadership.
But Trump talked about stopping at nothing to remake the American economy to radically improve the lives of all Americans. Harris talked about $25,000 to buy a house.