Labh Salem was a broader, more complex world than Anfang.
Thankfully, being able to put things into perspective was an art that Eren had learned and mastered ever since his rebirth in the second timeline.
Eren wasn't disheartened by the fact that being a Grandmaster-ranked entity wasn't a sign of greatness in Labh Salem.
Instead, he was content in knowing that he wasn't starting from scratch in a new world. His A-Rank still meant something here. He just needed to raise his standards to match with his current reality.
Eren discussed various things with Reen and told her his plans for the future. Reen was always talkative by nature. She liked turning tight-lipped Eren into someone who would tell her anything and everything he had going on in his mind.
And by doing that, she felt special, knowing that she was one of the only two people Eren could talk his heart out with. Of course, the other person was Alephee.