To obtain the Step by Step standard quest in Xenoblade Chronicles 3 Future Redeemed, speak with Jethro in Colony 9. For this quest, you’ll need to look for people with expertise to help erect new Remembrance Stones.
The first lost City Survivor is Cathy who can be found by the Ancient Rooftop Camp rest spot which is reachable via an ether slide.
Ruben is the second one! He can be found at the Inconspicuous Cave in the Vermilion Woods.
Once both City Survivors have been sent to Colony 9, find and speak with them there. When you’ve spoken to both Cathy and Ruben in Colony 9, meet them in the Central Plaza of Colony 9. As you approach the group, a cutscene will trigger and the quest will complete. As a reward, you’ll receive Hero Vambraces, 4710 EXP, 4650 Gold, Gem Unlock Kit and Shield Belt.