Ark in Hololive pretty much died with Coco, and it's unlikely it'll ever come back. These kinds of online sandbox survival games need a dedicated player group to stay relevant (no one wants to be miserable being the only one actually playing on the server), and with the driving force gone that got them on the game in the first place and held it all together, it quickly fell apart (even the talents who actually had a more than passing interest in Ark, like Choco or Aki, also dropped it).
Also Holo management, especially Omegatranny for EN, don't even really want them to pick up Ark again anyways, they want to push them rather to finally start FFXIV as their new main online social game, for whatever stupid reason.
(Ark sucks, but them becoming XIVXIVXIV-streamers would also suck, thank god so far no one is really biting and they're all rather dragging their feet)