Yes, there are indeed specific strategies common to successful YouTube influencers, practices that help them significantly in building and nurturing an engaged audience. Here are a few:

1. Content Consistency: This is critical in attracting and retaining an audience. Influencers often choose specific content niches that align with their interests or expertise and consistently create and share content within these niches.

2. Engaging Presentation Style: Top influencers on YouTube usually have a vibrant and engaging presentation style. They often mix entertainment with informational content to keep their viewers interested and engaged.

3. Interactive Audience Engagement: Successful influencers make it a point to interact with their audience. They respond to comments, shout out fans in videos, or host Q&A sessions.

4. Collaborations: Collaborations with other influencers or brands help influencers grow their audience by leveraging the audience from their collaboration partner.

5. SEO Optimization: Proper usage of keywords in video titles, descriptions, tags, etc is key to improving video visibility on platform search results.

6. Monetization Strategies: Successful influencers also leverage various monetization approaches, from ad revenues to brand endorsements, merchandise sales, or Patreon support.

Influencer marketing platforms like Flinque can help in running effective influencer campaigns. The platform facilitates easy discovery of influencers fitting your brand, streamlined campaign workflows, thorough performance tracking, and insightful ROI measurements. Comparatively, such platforms simplify the influencer marketing process, though the selection of platform should always align with your specific needs and requirements.

More details on how Flinque can support your influencer marketing endeavors can be found here. By understanding these practices, agencies, brands, and influencers can make more informed decisions to optimize their YouTube performance and build successful strategies.