We should not. This idea of starting a new party to do something has been exhaustively understood for a long time. All it is capable of doing is hurting the major party your new party is closest to. Best explained here.

It is exciting to create something new you have total control over, and that excitement can help you get off the ground and feel like you’re going somewhere, but this is an illusion, an eventually that momentum slams into a wall as you realize you’ve only shifted de facto political reality in the United States in the opposite direction you wanted to (again: because all third parties can do is steal votes from their most closely aligned major party).

Bernie Sanders has had this figured out for a long time. He shits on the rich morning and night. He’s also a grownup and knows that his only viable course is to try to shift one of the major parties themselves. He thinks he has better odds with the Democrats, and he’s probably right, though maybe “less bad odds” is a better characterization.

Entering into a major party is not fun and exciting and you don’t have a lot of control and quick momentum. But it is the only way. Small progress, long game. A flash in the pan 3rd party will only burn you.