A low-risk way to dip your toes in is to email a blogger to say that you enjoyed their post or that you found it helpful. The message doesn’t have to have useful information in it, just be sincere. Per OP, often there won’t be a reply but also often it’s much appreciated - particularly by non-mainstream writers.
I get dozens of cold emails and LI messages from sales/ recruiting a week. Only about one per year writes "I read your blog and liked your point about xyz." I always take that call. My LI (and HN) profile opens with my blog, so if they did 5 seconds of research they would find it.
I get those emails too but they’re always followed by “btw we sell so and so, do you got time for a demo?”
So when someone tells me they like my blog, i’m afraid to respond because they’ll just pitch me in response