Who to go for next?

I just got slkr and am about to get his ult. I have a very good se team and Def am going to pull cls rebels to r5 next but which would most of u guys recommend after that. Gas jkl or someone else completely? I'm not sure I wanna do another gl just yet and have made some progress towards both gas and jkl but still would have a ways to go. We can't do r8 mats in the guild with challenge rancor is the biggest issue with a gl so that would narrow me down to just rey see or jml. Any advice would be great and thank u for reading this :)
Forgot to mention I will also have the executor soon as I basically just need to put r8 mats on piette and Boba (hence not wanting to bother with more r8s)