On the Subject of Mental Health
The myth of the tortured artist is one we need to do away with.
On the Subject of Sincerity
If your characters believe in the world they’re inhabiting then it will be easier to convince your readers of the same.
On the Subject of Worldbuilding
Worldbuilding is important, but it can often become a trap. Focus on what parts of the world are actually important to your story and resist the urge to just add detail for its own sake.