You’d be better off reforming laws on political donations rather than starting a new party. Both parties have long been corrupted by lobbyists from various powerful and wealthy, concentrated interests, funding both sides, to curry favor with the eventual winner. Both parties represent these interests and don’t intentionally represent the average citizen voter of either party, they just pretend to.
If the powers that be wanted genuine democracy they would reduce the number of representatives, and allow people to vote on any issue they wanted to. This might have been too complicated to do not so long ago. With today’s technology it would be easy to accomplish. They will never let this happen, because they don’t think we are fit to actually make our own decisions.
Our democracies are an illusion, they are in reality oligarchies, pretending to let us plebs have our say.