I'm facing a similar challenge: how do I find directors and filmmakers? I'm a composer, and I want to meet people making films. So far I have reached out to my network, posted in online classifieds, browsed jobs offered/wanted boards, joined meetups, but it all feels like shooting in the dark. I imagine we might be going through the same thing.
I would really like to meet more student filmmakers, or filmmakers recently out of school, so maybe the same can be said for filmmakers looking for composers recently out of school too. I think about director/composer relationships, like Burton/Elfman, Abrams/Giacchino, etc, and I feel like they grow over time, from when these creators start in their career. If goal is to work on short films and features, as opposed to commercial and corporate work/sync opportunities, connecting with new directors and composers seems like the way to go.
I also feel like it depends where you are located. Here in nyc, it seems every request for composer post has at least 200 replies, so it feels daunting to try and add your voice to an already saturated market. It a smaller city, I imagine the opposite is true, it's probably hard to find somebody local who meets an expectation of quality and skill.
All the other suggestions on this thread are good too: IMDB page, paying whatever you can for music = value, cold calling, etc.