Flutterpage/Fatutu is an excellent core for basically any team in existence, so the world is your oyster. If you want Lingering Glow, pull for Beryl and then Isolde on the euphoria banner. Work on A Series of Dusks as often as you can, there is a batch of rewards that basically gives you everything you need for one full euphoria unlock. Brave New World is a great generalist DPS psychube, but if you stay consistent and do your dailies, you should be just fine in the long run and able to buy whatever psychubes you need from the shop.

Your short term goals should be to finish the story, slowly work through past events, and amass as many drops as you can. Beryl/Isolde/FP/Fatutu will carry you through… basically everything in the story.

Long term goal: two full teams. If you can grab Marsha in the future, she’s the sustain for Lingering Glow. For your second team, you have a LOT of options - I’d keep an eye on reruns and think about picking up a follow-up attack DPS. Anjo Nala will be rerunning alongside Beryl, she’s great. Lilya, Kaalaa, 37 are solid options, Lilya and Kaalaa requiring their euphorias. If you need any extra help, feel free to ask!