@Agent_Karyo@lemmy.world and @Elevator7009@lemmy.zip have been the only posters on !strategy@lemmy.world for at least a month.

With both of them switching to !strategy_games@piefed.world, it’s unlikely that !strategy@lemmy.world will stay active.

All you can do is post a sticky and hope people notice it, which means you’ll miss most of the users,

In my experience, you don’t, I regularly see people telling me they found the new community thanks to the pinned post. That is usually people looking for an active community, stumbling upon the old one and finding the new one thanks to the pinned post.