There are lots of strategies, tools and tactics one can use to make a blog 'popular'. But that shouldn't be the initial aim.
In my experience, it all starts with you having a unique and compelling message to share and knowing why you want to share it. It all goes from there.
Additional from what has been mentioned, webinars or online events are a great and engaging way to build an audience even if you don't have a a lot of content or post regularly. People are hungry for experiences that connect them with others in meaningful ways.