Who doesn't want loads of subscribers? They're people who follow all of your work. They're your fans. And why do people subscribe to you? Because they like you and your work. Most people think it's just that they like your work. but it's also that they like YOU. How do you get people to like you? By being nice and writing good things in your work. There's a people sense to everything, not just making good writing. And that's what possible subscribers want to see.
For example, if you saw a blog about, maybe, how to break bedrock in survival (which is possible; see my other blog) and it was just a list of steps for what to do. You might think it's good, and interesting. But it's just plain, it doesn't have that charm that makes people subscribe to you. What do I mean by that charm? I mean you have to say nice things. If it's a blog, you might include somewhere that everybody's beautiful and can achieve anything. Or if it's a skin, you might make a skin of a polar bear and write "Save the polar bears from global warming". That's what tells people you are a caring person, not some crazy net person. And not many people do that. They're too focused on making their work good, they don't really think about speaking to their viewers. 

So in the end, this isn't really a "trick". It's knowledge. Add it to your mental book.