I don’t know much about the upcoming battles, but none of the Shinjuku servants are worth rolling for *right now*, in my opinion.
Yan Qing (Assassin) is a lot of people’s husbando but not an amazing unit. But he gets plenty of rate ups after this so I’d wait if you want to pull him.
Emiya Alter is like Squirtoria Lite minus the value on the skills and the stupid NP refund. Not awful, but not a standout. He’s on a lot of banners after this (like Kiara’s banner in May) so I’d wait on him.
Archer of Shinjuku isn’t very good, but he is limited. (That’s right—LIMITED.) So definitely a rare unit to have.
Avenger is an ST Quick 4*...think the Dantes to Jalter’s Gorgon. Not awful, but again, not a standout. He’s story-locked, so again, a rare unit to have.
Salter is a great unit but there will be other opportunities to roll her with a 5* on rate-up, so this isn’t her best banner.
March, April, and May will bring is Arthur, Gil, Bride, Passionlip, Melt, Kiara, Okita...those are probably units more worth your quartz.