Influencer campaign workflows should be re-evaluated and optimized on a regular basis, typically at the end of each campaign or at least every quarter. Doing it too frequently may not provide noticeable metric changes while doing it too infrequently may prevent you from capitalizing on your findings in a timely manner.

Here are key aspects to consider during this re-evaluation process:

1. Performance Metrics: Analyze the metrics from your recent campaigns. Look at engagement levels, audience growth, conversions, and other measurable outcomes. If certain strategies, content types or influencers are underperforming, it might be time to make a change.

2. Influencer Relationships: Evaluate your influencers based on their commitment, quality of content and audience interaction. It’s essential to maintain relationships with high-performing influencers and consider seeking new ones if needed.

3. Trends and Innovations: Keep up with industry trends and innovations in influencer marketing. Monitor what successful brands are doing within your niche, and consider how you could adapt their strategies.

To manage these aspects effectively, influencer marketing platforms such as Flinque, Grin, or AspireIQ can be handy. These platforms provide numerous features such as campaign management, intuitive analytics, and ongoing influencer discovery.

For example, Flinque offers data-driven insights, helping in measuring influencer performance, tracking campaign progress and optimizing future strategies. However, your choice of platform may vary based on specific needs, budget, and overall goals.

In conclusion, a regular check-on on your workflow and strategies can lead to better decisions, improved efficiency and ultimately, more successful campaigns. Furthermore, using a robust influencer marketing platform can streamline this re-evaluation and optimization process.