I think it's fair to say Selen is the most professional out of everyone in NijiEN, and I don't say that to knock the other girls down. You see her organizing these collabs and using her Apex talents to her advantage--taking these big leaps that the other girls aren't taking and it's paying off. Her popularity has soared in such a short time frame, to the point her customizable voice pack sold out in two days. Even Pomu herself said she admires how much of a hard worker Selen is.
https://youtu.be/lCTm19kDHuo?t=2496
Of course, the disadvantage to all this is Selen putting unnecessary pressure on herself when she doesn't live up to her own standards, IIRC, it was in that unarchived stream where she let out her insecurities, like not doing enough for NijiEN. It's why she got so excited over getting streaming permission for Bloodhunt. Not just because it means she can play the game, but because it means all the other Niji branches who have been dying to stream the game can finally do it. However, you also get moments like the end of the Reignite Cup, where she was beating herself up for her poor performance (despite so many obstacles in her way that was completely out of her hands). She beat herself up because she thought she let down her fans and her colleagues. Thankfully, all of her fans and peers comforted her after she finally got her rest. It's why I'm glad the dragoons are encouraging her to rest when needed instead of playing 24/7 for their enjoyment.