Help on what to pull now

Hi there I'm a new player that just started a couple days ago. I got Miraidon and Koraidon now with a lot of content left to do so I think I'll still have a lot of free gems to go.

My question is should I get dupes of them? Which other banners would be worth to pull right now? I've also read the half anniversary is coming up next month so should I just wait on that? Thanks in advance.