Sentence examples for a fan from inspiring English sources

The phrase "a fan" is correct and usable in written English.
It can be used to refer to someone who has a strong interest or admiration for a particular person, group, or activity, such as a sports team or a musician.
Example: "As a lifelong fan of the band, I was thrilled to see them perform live for the first time."
Alternatives: "an admirer" or "a supporter".