they use that gear to do the normal raid, then use that gear to start on the next set of tome gear, which is used to progress in savage. once you reach best in slot from that, if you're ONLY healing and that's the ONLY thing you want to do, then just unsub until the next update. that's all I can suggest.

this game has no world pvp and never will, and XIV's dev philosophy doesn't favor a mythic+ type dungeon challenge system.

the only other thing would be to find yourself a group for Ultimate and do that when it comes out. if you're THAT good.