When your figure gets crowded it's always interesting to rethink how you will show variables.
To clear things up, you could change the opacity of a line or even put a dashed line instead.
With Matplotlib, you can make a dashed line with the linestyle (ls) attribute when plotting.
Here is an example of changing the style of a line plot
Here is the result
Here you are ! You now know how to make a dashed line in Python !