We need to partition the whole country so we cut off more than Maine. All of New England, the middle Atlantic (esp. DC), the entire West Coast, Minnesota, and Illinois (Chicago) need to join Canada and get walled off from the rest of us ASAP.
We need to have independent city states where the kooks can rule their roosts and not lord it over us.
Democratic cities over 400,000 people and adjacent counties that voted Democrat in 2020 would each become independent a year after ratification of the authorizing constitutional amendment. Within that year, local towns in the adjoining counties could vote to rejoin the Republican-ruled area and all contiguous areas so voting would do so. Republican islands would get stranded in their Democratic independent city state.
The then existing national debt would be paid via the existing federal corporate income tax and by a new flat rate sales tax levied in all areas now in the US.
Your citizenship would be determined on where you live 364 days after ratification.