I will try to explain what I need, and I hope you can provide me some info about what this "procedure" is called so I can search further on the internet.
I have a plot with "peaks" that happen on "different" levels, something like this:

And I would like to know if there exists any function that can strengthen these peaks to the same level like the peaks on the right, so it would look something like this (made in paint sorry):

I am not sure it is it called normalisation or something like this, but please can you help me find the exact definitions or functions I should search for? I am using mathplotlib.
I want to strengthen the low "y" to the level of max "y", even though my plot will change completely.
The hardest thing is that I don't know what to search for, or if this even exists, I will appreciate any help, thanks!