Welcome to the world of Visual Novels!
I haven't finished KonoSora yet so I really can't say much about what you'd like but you can't hate a good VN. I can't suggest Katawa Shoujo like most of the people above since I haven't read it yet but it was one that led people to playing more VNs so it should be good. As for me I'll suggest Grisaia no Kajitsu. It's pretty lengthy but it's worth your time although the atmosphere is a lot different from KonoSora.
Hmm if I'll suggest anything that's close to KonoSora, which is mainly about a club, it would either be Hoshizora no Memoria or Rewrite. Although the two only has the club as the side element but it's still part of the story. And if you want something more about school and about club activities it would be Princess Evangile but it's more on the elections rather than club activities. So yeah haven't read enough VNs to actually suggest really close.
And about that feeling of emptiness, we all feel that after seeing something really amazing in a personal level so even though you might hate it, it's a proof that you've seen something great.