I don't understand if they all live in the same city and like to see each other, why not make plans?? Go grocery shopping together? Take the train home together? Ask Kiyo to show you how to cook?
Also yeah I wish they were at least done high school and perhaps working while in college. At this...
@JokerH4o I read the light novel's official translation by buying the books. Amazon sells them but I buy them from my local manga store. You can buy a digital version of the official translation on some websites like global.bookwalker.jp (Amazon's kindle store might even have the ebook)...