If you found yourself transported to early 1788 Philadelphia, say about a year before the U.S. Constitution was signed, an if the Founding Fathers were all willing to hear you out, what would be some of the first things you’d say specifically to warn them and try to prevent some of the bad things that have happened in the real-world timeline since then? Basically, what differences would you want to see made to the U.S. Constitution from the beginning and how would you impress specifically on the Founding Fathers the necessity of diverging from their instincts in specifically those ways?
And keep in mind the Founding Fathers’ beliefs on things like slavery, “the free market”, guns, LGBTQIA+, etc.
I don’t think there’s anything terribly useful that could be said. There were already factions fighting over more central power or a loose confederation. Multiple attempts to get things going failed in various ways before finally something was agreed upon. You can look at the bill of rights and what that was a response to.
Some rando in weird clothes showing up claiming to have advice for them is probably not going to go well to begin with. The most rational response would be to get that nutjob out or in prison.