The Brawl system pairs brotherhoods for a 2-day competition. Because the BHs need to come in pairs, there is an obvious problem: if the total number of eligible BHs on some map is odd, one will be left out. This should only happen for the BHs that would normally end up in the lowest tier.

So, if your BH got low score in the previous Brawl and you didn't get a Brawl now, this is likely what has happened. It's by design and there is no remedy.

In this case, wait for the next Wednesday (mid-day UTC) to see if you are matched with an opponent for the next Brawl (you really should be). In the extremely unlikely case that you are not (so, you're about to miss your second Brawl in the row), please ping the Support here so they can look into it.