Sprawdzicie? Proszę

Apart from working hard, novelists, to be more successful, should enjoy their jobs. Thus, they should write when they are in high spirits, not compel themselves to anything. Novelists have to be involved in and attached to their stories. What is more, they cannot follow the commonplace paths, yet are to add freshness to their works. Such books should also show what determines a character’s complicated feelings and behavior.

Thus, they should write when they are in high spirits, not compel themselves to (tu cos brakuje) anything.
What is more, they cannot follow the 'commonplace' nie za bardzo trafne slowo) paths, yet (tu cos brakuje) are to add freshness to their works.
'behavior'-AmE, behaviour-BrE