If Dems want any chance of winning in 2026 (midterms), assuming we still have an election, there is only one path forward, and that is things that matter to Americans.
Economic issues that Sanders was successfully campaigning on in 2016 when he was thwarted in the primary. It’s not important to fight over what happened that year, but his platform is 100% the way forward to progress.
Bernie won his current senate seat as an independent this time around, I don’t think they even have him now.