CIMS breaks down an influencer's audience into four types:

Influencers — followers with more than 1,000 followers of their own.
Mass followers — accounts that follow more than 1,500 people.
Suspicious accounts — non-credible accounts that aren't mass followers.
Real people — everyone else. The audience you're really after.

A healthy creator profile leans heavily toward real people. Use this breakdown to sense-check an audience before committing budget.