I thought the concept was really nice for a cozy game! I'm not really sure what to suggest to add more content, but one idea that could be interesting would be to use the cards to tell a bit of the story behind the party from the night before. Maybe some gossip or little stories that the player gradually discovers.
For example, there could be five different cards that, together, tell the story of how the robot's owner got their new job. Each card would reveal a small piece of that story, encouraging the player to find the others to understand what happened.
I think that could be a fun way to build on a mechanic that's already in the game and add a bit more content.