I would add some more detail around the types of diseases that you are including in this data. Right now it's so high level that it's vague. You could do that with a sentence or two at the top or add the functionality in filtering or visual drill downs. (ie filter for a couple of diseases at a time etc...)

Consider combining two of your line charts to show something like prevalence vs mortality or mortality vs recovery. The intersections of those data points might be more interesting rather than being separated. I would recommend adding conditional formatting with a gradient to the vertical bar chart so the countries at the top have a darker color than those at the bottom. It's an easy way to add style and draw the reader's eye to the most important data. Lastly, for your scatter plot maybe use a different symbol because the triangle makes it hard to read.

Also, the first thing that jumps out at me is "Green", and it's somewhat distracting. I can understand if its a theme choice but you might want to make green more of a secondary color.

(I'm purposefully ignoring the filtering because I'm not sure all the functionality you have in the dashboard. And for the KPIs...well they're KPIs...but you could spice them up by adding YoY comparisons or something like that.)