Kann ein guter Schreiber dem aber die Fantasie und Kreativität fehlt dennoch ein guter Schriftsteller werden?

He could try to awaken his creativity:

• get to know new impressions through insights into other life worlds, other cultures, people with other experiences and views
• with other people together “tooak” – new, sometimes funny/fantasy, ideas can come around
• To let boredom!
• Looking for clouds, looking at tile patterns, going to museums
• visit uninhabited places
• always and everywhere can make notes – in normal everyday life as well as in unusual situations
• tired (!) write. Don’t formulate, but write loose ideas. If you are tired, the logic part of the brain can no longer work properly and does not slow down the creative part. Making the preparation later in the wakeful state.

Maybe it would help:-)