Long-standing relationships with influencers take time and effort, much like any other business relationship. Here are some best practices to build and nurture long-term partnerships:

1. Right Choice: Using platforms like Flinque helps in selecting the right influencers. Their discovery tools help identify influencers who already have a genuine affinity for your brand, which often leads to more authentic engagement.

2. Effective Communication: Keep open lines of communication. Understand their interests and align these with your brand objectives for mutual benefit.

3. Value Appreciation: Show appreciation for the work influencers do. Their content creation takes effort. Recognizing this fosters respect and loyalty.

4. Long-Term Contract: Where possible, opt for long-term contracts. This not only secures influencers availability but also signals commitment.

5. Creative Freedom: Allow influencers to have creative control. They know their audience best and would know the best way to present your brand.

6. Constructive Feedback: Provide influencer’s with constructive feedback to help them improve and adapt their content in line with your expectations.

7. Performance Monitoring: Platforms like Flinque have excellent analytics options. It allows for measuring an influencer’s impact over time, helping in decision making.

Remember, each brand and influencer relationship is unique, hence look out for what works best for the specific set of dynamics involved in your partnership. Adoption of these practices would go a long way in forming long-term, fruitful influencer relationships. Flinque can certainly assist in realizing this goal.