Note: This is a solo brainstorm, no offence will be taken if you ignore the entirety and just do stuff. I'm confident in your vision, Runey.
A long term money sink! Maybe some sort of ability to take a girl out, like shopping, or a short vacation, or something, spend money on her, impress her, and unlock some sort of "out of ordinary" scene. Repeated stuff should necessitate repeated spending of effort and money. OR, helping Nia with extra equipment, the grenades on display were quite nice. Getting more computing capacity for Android, perhaps even a full server room, which could also help Kali with more computing capacity (cooling of server rooms gets expensive in a hurry, perhaps it could be that if there is no money for coolant, it shuts down temporarily, or only works temporarily when you buy a canister of coolant).
Maybe get the main character a hobby, like collecting art, which could help the bar perhaps? Or make it multiple choice between different hobbies? On a related note, some more intricate management elements for the bar would be nice. Perhaps some sort of ability to work with Autums family's café/farm?
TL;DR
The management element. I'd like to see that expanded upon.