I actually agree with a lot of what you're saying, except perhaps what is considered center. I absolutely agree we could use a more left-leaning party, whether that is the NDP or a new party, but more importantly, we need a system that allows more than two parties to consistently have a meaningful impact in government.
I don't necessarily think this new party, or the new NDP, should be as left-leaning as you do, but that also wouldn't matter as much if we didn't have the lack of representation that parties with less but still notable support receive in our current system.