Bié xiě de bùshírénjiānyānhuǒ, dúzhě yào de shì zhēnshí gǎn.
Don't write as if detached from reality; readers want something grounded.
Tips
culture
Literally 'does not eat mortal fire-cooked food' — a description originally applied to Daoist immortals who sustained themselves on dew and qi. Now used both admiringly (pure, ethereal) and critically (out of touch).
register
Can be a compliment (saintly, pure) or a mild jab (naive, disconnected from real life). Tone depends on context.