I'm not sure, but you could probably revive it or build your own. All it really takes is a few active users to start a new community. I'm looking for a new project and wouldn't mind helping you get this or another community off the ground.
Here are a couple of posts I found when looking for more information on the current state of Lemmy AMAs. They show community sentiment and past attempts to get started.
A ton of subreddit replacement communities were created around the time of Reddit's API changes, and there simply weren't enough users to keep them going.
Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !amarequests@lemmy.world