Usage patterns
〈事〉を楽観的に考えるto think optimistically about something
He thinks optimistically about the future.
〈事〉について楽観的だto be optimistic about something
She is optimistic about the economic recovery.
楽観的な見方an optimistic view/perspective
An optimistic view is needed for this problem.
楽観的な予測an optimistic prediction/forecast
The expert released an optimistic forecast.