I would like to know if it would be okay to use
”I was once a fan”
“I was a fan”
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"Was once a fan" implies that the person is no longer a fan (there is, however, an idiomatic expression "Once a ____, always a ____"). "Was a fan" does not allude to the current state of the person described. The second sentence is always correct, the first is only correct when the person is no longer a fan.