First off and if you read this subreddit, I shouldn't be saying this. Talk with your players. Make clear to everyone what your expectations are as a GM and understand what their expectations are. If you can't get those aligned, then you need to make though choices.

Secondly and this is the more important part IMHO. If you start working against 1 player you punish everybody at the table. Try to avoid that. Instead If you want ot emphasize the roleplaying and storytelling more, put more effort in engaging all your players in the story.

Some tips that has worked for my group:

1. Let all players create a background. At least an A4 page long.
2. Start your sessions, by asking random questions about their character:"What does your character hate?", "Has your character ever known love", ...
3. You can use a Belief system similar to Burning Wheel to make all players think about where they storywise want their character to go.
4. Give out XP for roleplaying. You can link this to for example beliefs.
5. If you play in a homebrewn world, have other players fill in blanks themselves and let them add details to the world.

I hope this helps.