The best place to start is on social media. I've already generated some positive social media engagement by replying to posts or tagging others in my comments. You can also comment directly on their blog.
Don't see this as an opportunity to ask for a favor. Consider it an attempt to win a friend. Try to female database start a conversation. Add something useful or a unique perspective to your comments, beyond just "good post" or "I agree."
Once you feel you have built a relationship with the person, it's time to send an email:
Hello (person's name),
You probably recognize my name from the conversations we've had on (social network). I really liked the point you made about (topic you discussed). That really makes sense!
I was checking out your blog and saw the post about (topic). The way you discussed (point from the blog post) was truly unique. I actually have a (post, e-book, infographic, etc.) that covers (related topic). Here's the link if you'd like to include it in your blog post: (Insert link)
Either way, I'll keep up with your blog posts, they're really informative!
3.
Influencers always give great advice and tips. If you follow an influencer, you've probably already implemented some of that advice in your life.
Let's imagine you run a travel blog and decide to follow an influencer's advice on how to pack for long trips in a suitcase using packing cubes.