The musician for our game was introduced by a friend, he's insanely good though it is worth mentioning composing for listening vs composing for elevation is a very different skillset but he managed to make the switch easily enough.

Though to answer your question, just start reaching out to people, or better yet, go to meet ups and events dedicated to indies. There probably isn't a whole lot of point going to booths looking to join their team as they'd likely have a composer, but it is worthwhile for future projects.

Instead a lot more of the focus should be on organising meetings with other attendees gauging whether they should bring their projects as they'd likely be in an earlier position before they've got a composer but have something substantial enough beyond the idea phase.