@jaykath10 There are absolutely population issues in 6's, especially outside peak hours (and probably a little worse right now with holidays and people being busy). Goaltenders are particularly scarce.
You can try searching +/- 1 player (or 2). 6v4 is better than not playing at all.
You can also choose not to match goaltender.
I know this isn't ideal, but you're going to have a hard time matching otherwise.
3's has pretty much taken over. There's no incentive for players to learn and participate in 6's and no push from a development or marketing standpoint to get more players into 6's.