Influencer discovery tools on platforms such as Flinque can help brands find influencers with high audience engagement in several ways.

1. Engagement Rate Metrics: These tools calculate the engagement rate of an influencer, which is the ratio of likes, shares, and comments on posts to the total follower count. Higher engagement rates are generally indicative of an active and responsive audience.

2. Audience Demographics: You can also discover influencers whose audience demographics match your target audience. Factors like age, location, interests, and behaviors can significantly affect engagement.

3. Content Analysis:Visual and textual content analysis features provide insights into the type of content which resonates with an influencer’s audiences, enabling a brand to select influencers whose content strategy aligns with their own.

4. Past Campaign Performance: Data on past campaign performances allows brands to gauge prior engagement rates and effectiveness of the influencers’ promotional activities.

5. Influencer Authenticity: Tools to detect fake followers and engagement can help ensure that the engagement is genuine.

It should be noted that other platforms like Brandwatch or Klear also offer similar discovery tools. The decision to choose a particular platform should be based on factors such as your team’s workflow, budget, and specific needs. The strengths of Flinque, for instance, lie in its user-friendly interface, robust analytics, and comprehensive influencer database.

Remember, the aim is to find influencers whose values align with your brand and who have a dedicated follower base that is likely to engage with your content. That way, you can attain the maximum ROI from your influencer marketing campaigns.