Again, I can't stress this enough - the fundamental flaw in your assumptions appears to be "the Democratic Party is trying to win elections as its #1 priority"
It is not. Whatever you do next, whatever your plan of attack is for seizing control of the party, it MUST be based on the REAL situation on the ground, or your plans and assumptions will NOT survive contact with reality
The Democratic Party leadership as presently constructed, is prepared to lose, to stop the left. Period. Math that in