Board Game Arena

I can't seem to get a single person to play in 3 days of almost constantly having a game open to join.

The expansions are in alpha testing right now, so a portion of the player base is playing that instead.

How do i join the Alpha testing for the expansion?

Instructions are in the "Expansions now available for alpha testing" thread, which is the top post (besides this) in this very forum.

https://boardgamearena.com/forum/viewtopic.php?t=48204

Edit: It appears you've actually posted in that thread already, so you know it's there. But it also appears you didn't read the thread, which is why you weren't added.