Finding other private pilots to fly with

How do you all find other private pilots to fly with on a regular basis? I have 1 or 2 that I know, but they're usually not available to fly the same times I want to and vice-versa.

I'm part of a flying club here in California, but there's no formal method to arrange co-flights other than talking to people at the club, which I'm not usually at unless I'm already flying somewhere.

There are a lot of cool spots to fly to, but it's very expensive to rent a plane and I'd love to consistently share a flight there and back with another private pilot (switching on the way back) so that it's cheaper overall.

Would love some suggestions for groups, apps, sites, etc. that can help with matching with other pilots in the area who have the same type rating and VFR license like I do.

Thanks!