You know who your subscribers are, don't you? No? Bad news: you can't write popular posts. To get a lot of likes and comments, you need to understand who you are writing to.
Learn which of your posts are more popular, how the audience reacts to humor, to serious texts, to different types of content. Determine the tone of voice that your subscribers prefer. Don't forget to interact with the audience - ask questions, respond to comments, actively participate in discussions. Ignore people and they'll start to ignore you. Nobody likes a one-way street.