Great question. I had a look at some of your titles. Although I rarely give this advice, my advice would be to make your titles more accessible to the average reader. Currently a title might only be reaching people in a tiny speck of the Medium audience base.
For example most readers don't know what the "tonga of the mironga of cabuletê" is.
By using less niched words, more people that may be interested in your knowledge can discover it.
A good resource I'd recommend is this video about YouTube titles, I would say the same applies to Medium titles. (And cover photos.)