If your whole argument is about what Our Revolution did and literally based on no other polling numbers then that is one of the weakest arguments you could make about Bernie's chances in November. AOC, Tlaib, and Omar are all women of color who did not shy away from socialist-esque talking points and who all won. Some lady running in suburban Texas not winning as a self-proclaimed DSA doesn't mean shit about Biden, Pete, or anyone else and would be the most dumb thing to point at when we have actual polling data. There's been, what, 60 years of McCarthyism-style propaganda against the word "socialism," I am not surprised the first time since then that people who embraced Bernie didn't get swept into office, it's going to take years and years of olds dying off before we get anywhere near the kind of electorate I'd like regardless of whether Bernie wins the presidency.
Are you just completely ignorant of how hard it is to win any kind of election without big money support? It's why AOC is basically trying to fund a separate PAC right now because the DCCC is refusing to fund real progressive challengers where they face an up-hill battle.