While I think the members of Red Star mean well and their faction generally has good positions, I've gotta push back on the idea that they've significantly pushed DSA's international work broadly or their anti-zionist work specifically in a better direction. The recent gutting of the anti-zionist resolution by the NPC and the retraction of the statements on the Venezuelan election and the Israeli assassination in Iran show that at the highest level DSA is firmly in control of chauvinist social democrats on these issues (I had to scoff when I heard of the "left" NPC getting elected last year, as if Bread and Roses are left lol)
Furthermore, DSA's position on the presidential election has always been firmly invested in working within the Democratic party as seen by their focus on the "uncommitted" movement and their recent statement about Harris picking Walz as her VP. They still hide in their dirty break/party surrogate position which functionally ends up the same as the CP's line.
There are a lot of good people in DSA and I learned a lot when I was a member but the organization is fundamentally repelled by any sort of discipline and the social fascists on it's right wing maintain their power through that disorder and have demonstated that they do not care if their opportunism harms the organization or anyone else for that matter. Changing it into something viable would take an immense amount of work that would be sabotaged by SMC/Groundwork/B&R every step of the way, or you could just join an actual Leninist org.