I wish you the very best of luck. The main issues you'll have will be, in order: funding, funding and funding.
Anyone being serious about this will have to spend most of their time thinking about that. Its why they always, eventually, end up being g captured by the powers that be. But they can do a lot of good before then, in the right circumstances.
One solution is through part of the party being a sort of union of trade unions. Unions have money, similar values and members who would potentially join. Membership subs would be another. They can do an awful lot of good but unions can also come with their own long list of problems you'll have to keep your eye on.
Whatever name you choose, check out the formation of political labour movements, as a kind of road map to building what you want. An example would be the labour party in the UK or NZ. It'll have to be done your way and for an American electorate of course but im sure you won't need any inspiration from me or any other country for that part.
"Its everyone else's fault but my own that I chose the misogynistic racist."
It wouldn't have mattered what the dems did. Trump offered the most concessions to the ultra wealthy. Just like when the Democrats win, thats what decides it.