The social media structure of Medium is what sets it apart from other blogging solutions like Wordpress and Squarespace. This gives a blog a much higher traffic compared to if you were to set up your own website, although it does limit the level of control you have over your blog too.
There are a few crucial things to growing your presence on Medium: Quality content, Presentation, Engagement and Branding. Your content and visuals are great and I suggest that you focus on expanding your network by getting engaged in discussions and guest blogging: there are many medium publications that you could send your articles to! If you are actively using any other social networks, ask you followers to follow you and like your posts - this will push your articles up the feed, increasing the chances to be seen.
Refer to the article How to grow your blog on Medium for more tips!