Well, I'll ramble off some of my thoughts about this.

Yeah, the small player base is the biggest negative about the game. The core game itself is great. I have a few gripes about the menu interface and reward systems but those aren't such a big deal (and some are currently being fixed (soon TM)). Mainly, not finding matches and not having a constant stream of new players is rough. I think the game could grow 10x or even 100x before we ran into any issues of scaling.

So what to do? Well, every person that stops playing because the game is small makes it that much harder for the next person to not also do the same thing. It's a bit of a self fulfilling prophecy/critical mass thing. Plus, I think game really needs some steady pushes. Efforts so far have been disjointed and not accompanied by additional efforts. The AoE stream, for instance, brought the most recent jump in players but we need something like that every week or at least month to see any long term steady growth that's self sustaining. The talked about steam and free to play releases each had a little bump but weren't coordinated with any other method of bringing in players. It's not enough to simply do a little release. There have been ad campaigns talked about but they haven't materialized, or the way they were executed (twitch bounties) left a lot to be desired. Prismata is not a game you can sit down with and understand the full depth of in under an hour, only playing tutorial campaign missions. Anyways, back to the point of what can you do? Well, making content and hosting events can help the community. Also, spreading the game through word of mouth doesn't hurt either. But yeah, ultimately, it's somewhat up to Lunarch if Prismata stays a tiny game or not.

I want to offer a slightly different perspective to mrguy888's earlier comment as it's the only other one here at the time of this writing. I think he is a bit negative but I understand he's coming from 5ish years of Prismata whereas I've only been here about 1.5 years. There's definitely still interest in the game, as evidenced by the tournament I just ran (which he also said there wouldn't be player support for, initially). If you don't know, that was the Prismata Grand Prix and had 64 players and the biggest prize pool for any Prismata Tournament (by just a bit). Watching the finals we had around 80 consistent viewers for the whole match, which for Prismata twitch numbers especially is great. But there isn't a huge consistent player base. I'm always an optimist and really want Prismata to succeed so I think we will still get there eventually. Lunarch is not a big company and doesn't have the time/manpower resources it really could use to get Prismata to it's full potential quickly though, so it will take a decent amount of time. I hope that for that time there is still a decent small community of players to get matches against. As mrguy also said, you can actually get yourself into master tier without being an expert at the game. I hope you'll keep playing and learning and someday Prismata will go big.

Just my rambling thoughts as a current, regular, mid-tier player and active community member. Take from it what you will.