Here’s a pro tip I didn’t figure out until my second GL farm:
Try to plan ahead for how much gear/zetas you’ll need, to immediately take a GL to as high a relic level as possible, after you unlock them. Start working on a top tier mod set for your GL, before you unlock them. You always want to have your GL at R7-9 with top tier mods anyway, so just plan for it. Why would you want a GL at g12 with crap mods? It would be a tremendous waste, might as well not even have it.
Yes the Rey unlock is a bit more challenging out of the three GLs I’ve unlocked so far, but honestly it’s not really all that hard once you get it dialed in. I dropped two battles at the beginning and then once I got the hang of it and got Rey’s GL unique zeta, I cruised through the rest of it. I did it without zetas on anyone but Rey. Use Rey, RHF, RHP, JTR, BB8. Watch BitDynasty’s guide on YT and learn the strategy. You really want Rey at R7+ for the ultimate tier and honestly you should be taking her to R9 as soon as you possibly can. The zetas I did it with are Lifeblood, Whirlwind, Lead, and Galactic Legend, you don’t need the other two, but I would say all four of those are fairly important. You could probably get by without the Leadership, it just gives you an extra failsafe. The other three I listed are pretty much essential.
All that being said, the ticket grind is the worst part of the game by far, as far as I can tell, reviled by the entire player base. I’d love to see it trashed entirely and just replaced by energy cost for the battles, but I’m sure everyone who already unlocked GLs would throw a huge hissy fit, so don’t expect it to happen.
And for your next GL, just plan ahead.
