For better or worse, the US constitution does not have provisions or a process for dissolving itself and developing a new constitution.

The closest thing we have is the amendment process. In theory we could use that to rewrite the entirety of the constitution[0], but good luck getting the required votes in place on any possible replacement. The bar is pretty high: amendments need to be proposed by either a vote of 2/3 of Congress, or by a constitutional convention convened by 2/3 of the state legislatures, and then ratified by 3/4 of all state legislatures.

We couldn't get that sort of agreement to pass something as theoretically uncontroversial as the Equal Rights Amendment. It's laughable to think we could pass a "new constitution" that way.

I expect the only way we could end up with a new constitution is through a bloody civil war, or some sort of coup. Hopefully no one wants something like that, though. I certainly don't.

[0] Technically the entirety of the constitution can't be amended; Article V, Section 5 prohibits an amendment from changing each state's equal representation in the Senate. Though I suppose a "rewrite amendment" might get around that by preserving the Senate as-is as a ceremonial body without any power. That would certainly violate the spirit of that wording in Article V, so I imagine it would be challenged in court.

We don’t need a full rewrite. Despite the divisions in this country, there are a couple things that most people agree on:

- Corporate money should be out of politics

- Gerrymandering should be stopped

If we had amendments for these two things, it could change A LOT. Congress might actually be able to function. Corporate corruption could be prosecuted. We might be possible to put meaningful limits on corporate power.

Of course, the devil’s in the details. How do you write amendments for these two things in a way that actually accomplishes the goals? But though it would be difficult, I don’t think it would be impossible.

Can we throw some form of ranked choice voting in there as well? As someone unhappy with either major party, I want the ability to vote what I actually want with a backup vote indicating what I absolutely don't want under any circumstances.

It's worth noting that Article V, Section 5 doesn't prohibit itself from being amended away. So you just need the constitutional convention to refer two new amendments: the first one stripping the restriction itself, and the second one to do what the restriction prohibited being done.

So theoretically if any one of the party in american system gets 2/3rd people of the same party and they all agree to one person and try to amend the constitution itself to add whatever they want, can't they theoretically create a purest form of dictatorship (one which lasts forever instead of just 5 years)

I mean given how much is already happening in America, I am just curious from a legal standpoint if there could be done something like that (forgetting the insane backlash but still), what could the president of america do to completely sieze the constitution ?

Put it under a the peoples direct majority vote to reset to a past working version control?