If the community is active, you can ask the admin or one of the mods if they're looking for more active mods and see what they say.
If the community is truly dead, then you're best off to create a new community yourself which you'd own, and then work at getting folks to join.
Please can i chat you up, if yes, this is my WhatsApp contact.
I don't actually have or use WhatsApp, but if you have Discord you can feel free to hit me up and I'll try to answer questions for you. SanguineHaze#7826 is my user in Discord.
Ok
@Wizard#2940 is my Discord username, having been chatting you up.