At your level, I think you will be able to get Thrawn at 6 stars, but not 7. In January when he was last around, I was level 70 and got him at 6 stars. The only players in my arena shard who got Thrawn at 7 stars were level 76 or higher and they had all 5 Phoenix characters for the event at gear 9.
I’m pretty sure I’ll be able to get Thrawn at 7 stars this time around, since 3 are at gear 9 and I’ve been putting omegas on their uniques. Here’s where I am now, if it helps: https://swgoh.gg/u/kaimulai/squads/26311/
I also can swap on my arena mods if needed to make them faster.
