I'm wondering if getting together as in-game parties will help matchmaking. If you're willing, share your platform and gamertag here, so others can friend you and meet up in-game.
Probably best to put "Raiders" or something in the message when you send a request, so folks know what it's for.
I'm on PS4, my gamertag is EmmaGees
I'm in the US, and will likely be on most later Saturday night and as much as possible Sunday.