Describe 10 practical strategies for how companies and brands can create successful content collaborations with influencers to sustainably increase reach, credibility, and engagement on social media.

Context: [Influencer Marketing, Content Collaboration, Social Media, Reach, Engagement, Brand Communication, Cooperation, Target Audience Addressing]

Goal: [effective collaborations, authentic content, clear goal definition, sustainable partnerships, measurable success]

For each strategy explain:
1) a concrete approach or best practice for working with influencers
2) practical tips for selection, communication, and joint content creation
3) the expected benefit for brand presence and user engagement

The strategies should:
- be suitable for marketing managers and social media managers
- be applicable for both small and large companies
- address typical challenges in influencer collaborations
- contribute to the long-term strengthening of brand perception