That's the last thing they should do. Biden did that. He pulled out of Afghanistan like they wanted, and it wasn't good enough. He tried to cancel their student debt, which was overall unpopular, and it wasn't good enough. He passed the largest infrastructure bill ever that included the most spending for green energy ever, included a cap on insulin like Bernie Sanders had wanted, allowed Medicare to negotiate drug prices like they wanted, and AOC voted no on it because it didn't include everything on her wish list. Biden also passed the first gun safety bill in nearly 30 years, and they just shrugged. AOC voted with Marjorie Taylor Greene on sanctions on Russia and capped it off by supporting terrorists in a conflict halfway around the world that didn't involve US troops. They wanted Biden to call for a ceasefire, he did, and they moved to an arms embargo. They wanted Biden to be anti-Israel. They moved Biden to the left and he was the most progressive president since Johnson, and they threw him under the bus. On top of that, progressives did horribly in the primaries. A couple of them even lost. Normal Democrats did fine down ballot.
You know who one of the most popular governors in the country is? Andy Beshear, a normal rank and file Dem in ruby red Kentucky. That's who Dems should merge with.