How do I join a specific Brawlhalla clan as a limited Steam user?

I was playing a random free-for-all match in Brawlhalla and after the match, 2 of the other players were impressed enough with me that they invited me into their clan in the chat. When I asked them to walk me through how to do it, they said to add them to friends on Steam. When I tried doing that, Steam said I wasn’t allowed to. I tried to tell the other players that, but I accidentally hit the wrong keys before I opened the chatbox, which made me leave the game lobby and cut me off from those guys. I tried joining a few more matches hoping I’d bump into them again, but no luck.

After looking up details on Steam and elsewhere, I learned that limited Steam accounts have restrictions placed on them if they haven’t bought $5.00 USD or at least have that much in their Steam wallet. Now, I don’t have ANY money at all to change this, and I won’t get some any time soon. So, according to Steam the only way to add friends is if that person adds me instead, assuming they aren’t a limited account as well. That’s fine and all, but I don’t know how to contact those people anymore now that I lost track of them. Is there any way for me to find those specific players and/or their clan and join up, without having to endlessly comb the matchmaking lobbies? I remember their usernames (not their account names) and their Brawlhalla clan name, but I don’t know where to go from here. I’m not that familiar with either Steam or Brawlhalla to begin with, and I’m hoping that there’s a direct solution I just haven’t found.