What do I need to do to get Thrawn at least 6*?

Calastar

I have all of my best mods on my phoenix squadron, and I do not have sufficient credits to upgrade the mods. I will be able to upgrade some of their abilities in the next few days, but I can't get past the 6* event.

https://swgoh.gg/u/calastar/collection/?f=phoenix

Kai_Mulai

I’d get everyone to g8 first if possible

Calastar

I got 6* Thrawn, will not be able to get him 7* this time around. Thanks!