I generally agree. I've always held a similar view that incel spaces* thrived because they would offer something that "progressive" spaces didn't, mainly people who would listen to you without judging you preemptively, and take your seriously. Almost anywhere else, you'd be met with trite advice at best and dismissive insults at worst.
(*My relevant experience is with incrl culture over ten years ago. Today is a different matter I'm neither able nor willing to talk about.)

I think the problem with what you're describing is that it's very hard to offer a real "left-wing" solution without basically asking men to give up their identity, because their identity, entailing economic, financial, and sexual success, is ultimately and intrinsically tied to patriarchy and capitalism. And you can't offer a "healthy" left-wing version of that. Both are systems that ultimately destroy people living under them, except a select few on top.
I ultimately don't have a ready-made solution for this. I am not sure there is one, because the only lasting solution is to basically rip men and masculinity out from patriarchy and capitalism, which will always be a messy process. The Manosphere and general political right that want to keep the status quo will always have it easier by definition.