Definitely go to GDC in SF if you can make it in March. That’s THE place to go meet people in games and especially in audio. There’s an audio track and you get to meet all the members of our very small community. ModDB is sort of a wasteland, and you’ll have better luck trying to hook onto a student project or another game jam (there are game jams happening online all of the time, GGJ is just the biggest one). Check out IGDA as they may have a chapter near you and meetup.com for game dev meetups near you.
In the meantime, try your hand at downloading some game projects (free) from Unity and throw your own sounds into the game. Or check out audiokinetic.com and their current download of Wwise includes a copy of Limbo so you can replace your own sounds and music. You’ll learn a TON! and then you’ll have something for your reel as well.