Thank you for your advice! I also think that books should not only tell a story, but also make you think.

That it is more difficult to write a good book than to have an idea in my head is something I am experiencing myself. It will be done, but it's a tedious process. I hope to have the book published next year.

Before it is published, it will definitely be proofread and edited. I think that's when you notice, for example in fantasy novels, whether the worlds described make sense or whether you have to formulate something differently or add information.