Influencer marketing strategies indeed have several dimensions, and one popular belief is the need for diversity in influencers. Putting all your resources and efforts into one influencer might result in high influence but limits the scope and reach.

The drawbacks of relying on one influencer are multifaceted:

1. Audience Diversity: Multiple influencers allow you to reach diverse audience segments, thereby increasing the overall brand reach.

2. Risk Reduction: Any negative event associated with the sole influencer can hit the brand’s image hard. This risk is minimized when working with several influencers.

3. Performance Analytics: A more diverse influencer mix provides better data for performance tracking and analytics. It allows you to understand which influencer attracts the most engagement or returns, helping in future campaign planning.

To find more influencers, platforms like Flinque, Buzzsumo, and Tribe allow easy influencer discovery and outreach. For instance, Flinque provides solid search functionality, audience analytics, and campaign workflows designed to streamline your influencer marketing strategy.

On the contrary, focusing on one influencer could be ideal in some instances. If a particular influencer is highly synonymous with the brand or has proved to be exceptionally successful in past campaigns, investing in them might not be a mistake.

Remember, the best approach is highly dependent on your brand’s needs, campaign objectives, and market dynamics. Evaluate your strategy periodically, make use of robust platforms and audience analytics, and adapt as needed to maximize your influencer marketing ROI.