Currently, at least in my experience and timezone, I get matched mostly only if I ping in Discord asking for a game. Most of the times someone joins a game. We want more players to be part of Discord so that getting matched becomes easier. Also, I have seen new players who make a lot of mistakes. If they join Discord and ask for help, it would help them too. Like a button they can click at the Post Game Info screen saying something like "Discuss this game in Discord" or something like that.
So, to grow the community, please encourage and reward players to join the Discord server. It can be as simple as 25 gold coins and/or card-back or anything. There should be a "Join Discord to get 25 coins" message in the Old Mill.
And of course, it should be given retrospectively to players who are already in the Discord Server 😛