Create your own.
This is the key for us to break through from internet shitposting movement to revolutionary coalition. Every IRL group has problems that keep the inquisitive Holla Forumsack from joining. IE are a bunchy of directionless preppies with floppy hair (and possibly a honeypot), AmVan is, well, we've got a whole thread about that, the TRS Implicit Pool Party Network™ is obviously out, NPI supports muh based Zionist right-wing joos who totally hate muslims guise, (not to mention it's run by Implicit McPunchyface), and on and on and on.
My theory on what we can do about this came to me when I realized one thing:
Online groups are to IRL groups as civic nationalism is to ethnonationalism.
Think about it. Civic nationalism, or proposition nationalism, relies on a shared culture and belief system to unite a people, rather than blood and soil. In the same way, online communities rely on shared culture to distinguish themselves. Which brings me to my next point:
The best way to stop infighting is to leave your online groups and start your own IRL group.
I know a lot of us are dejected and lost in a sea of brown. But, if you have at least one redpilled friend, start doing things with him. They don't even have to be activism-related. Start holding each other accountable to stay in shape both physically and mentally. Go to the gym. Read good books. Forge camaraderie. If you have more friends, even better. They don't have to agree with you on everything, which is the entire point of this.
Camaraderie replaces a need for perfectly shared beliefs with something better.
There are members of my group who are still Daily Shill-a fans, even after I've shown them all the evidence. Some of our members are still in the "racist libertarian" phase. One of them still believes that the Holocaust happened. (We're working on him.) Nevertheless, we're still all the strongest of comrades. We drink together, we work out together, we argue together, and we, in one instance, fight antifa together. (This one was my fault.) I'd die for any of these guys, and they'd do the same for me. Even when we can't meet up, we have a chat channel that we use to communicate, plan, and banter, which is really good for group cohesion. (Don't, obviously, use this to discuss sensitive material, as any of those apps can be hacked.)