Indeed. Dead content is dead. Sigmascape is about to be there.

Best bet for running old content is probably to find an active, raiding FC. For current content you just need to hit up that PF

And yes, as Death mentions, you're best bet for finding a static will be the recruitment discords. There are several just google them. The other popular option is using Reddit, set up a post LF group or browse through groups LF members. Other than that you can try to spend time advertising in PF that you are looking for group (or you can make your own)