I've found Slack helpful. I'm in a few myself. A couple coworking spaces have them and the companies share jobs and ask questions, etc. Easy way to build credibility as a thought leader and have connections to leverage on a rainy day. I also found out about some by attending conferences. All Things Open was a huge networking opportunity. tbf, it's a lot for me to be social in-person so Slack in particular helps keep those relationships active with low pressure lol.