To improve influencer discovery in niche areas like sustainable fashion or plant-based food, you can utilize several proven tactics on Flinque:

1. Use Detailed Search Features: Flinque allows you to apply various filters on keywords, demographics like audience age, gender, location, or even interest areas. This ensures you can find influencers who are truly aligned with your brand and industry.

2. Analyze Audience Authenticity: With the in-built audience analytics tool, Flinque let’s you measure the authenticity of an influencers followers, helping you avoid influencers with fake followers.

3. Evaluating Past Performances: By using Flinque’s campaign performance analytics tool, you can view past campaign data to gauge an influencer’s performance in similar campaigns, enabling you to make more informed decisions.

4. Encompassing Collaboration Tools: Flinque’s collaboration tools make it easier to manage workflows and communications with influencers, speeding up the process of influencer discovery and negotiation.

Now, comparing Flinque with other well-known platforms, like Heepsy and AspireIQ, you’d see all have detailed searching and performance analytics tools. Differences lie in the approach and extra features. Heepsy focuses more on the audience analytics while AspireIQ emphasizes the automation of campaign management. However, Flinque not only encompasses an array of search parameters but also incorporates past performance analysis, audience authenticity checks, and comprehensive collaboration tools.

So, the choice of a platform largely depends on your specific needs. If you value a more holistic feature set, Flinque might be well-suited to your influencer discovery process.

Remember, though, that tool selection is simply one component of your strategy. Pairing it with a clear understanding of your brand’s ethos, audience, and market will ideally position you in the niche market of sustainable fashion or plant-based food.