I will use the US constitution as the standard.

The founding fathers got right:

1A, 2A, 4A, and 10A especially.

We have allowed 10A abuses which cause most of our problems.

They got wrong:

Don’t let congress control HOW MUCH to spend as well as WHERE to spend. There should be a check on that.

Congressional term limits, although this is more libertarian to let everyone run and not restrict anyone, even the octogenarians. So I could see keeping that.

If 10A was brutally enforced (as it should be): There would only be State, Treasury, Commerce and Defense, and there would be much larger state governments which don’t have a money printer so would eventually be held accountable.

And “social security “ if it existed would be at the state level and therefore need to be solvent.

10A is the way.