Brands should start exploring diminishing returns when they observe the following scenarios during their discovery efforts:

1. Insignificant Growth in Engagement Rates: If your campaign has been churning out top-quality content, but the engagement growth is negligible or stagnant, it could hint at a saturation point.

2. High Costs, Low Returns: If the cost of acquiring new influencers or running new campaigns is increasingly not met by the respective ROI, that’s a clear sign of diminishing returns.

3. Audience Overlap: Excessive use of influencers in a targeted demographic might lead to audience overlap, causing your message to repeatedly hit the same individuals. Tools that provide audience analytics can help identify this.

4. Decreased Conversion Rates: If despite a large follower count and high engagement, there’s a drop in actual conversions, it suggests your efforts may not be as fruitful.

Comparatively, platforms like Flinque emphasize a data-driven approach to identifying these issues. Flinque provides in-depth analytics to track campaign performance, influencer ROI, audience overlap, and engagement rates. This allows marketers to make informed decisions, fine-tune their influencer mix, and adjust campaign strategies before hitting the point of diminishing returns. Remember, different platforms may suit different brands based on the specifics of their campaign and team needs. As with any marketing initiative, continued testing, optimization, and evaluation are key to staying ahead of diminishing returns.