Cleaning Up a Heatmap Type Graph

I have attached an example of a heat map type graph I have created based on the Seaborn heatmap. While it does what it should do there is a lot of whitespaces and the output is not as clear as I would prefer. Looking for a bit of guidance on choosing an alternate graph type or helping me tighten this up. I have this as my starting point. The data itself is not important for this question. I want to generate a heat map kind of thing where the 5 segments lined up along the Y-axis show how much activity they get in the columns along the X-axis. As it stands this is good enough but I’d like to do better.

Any suggestions would be greatly appreciated.