There really is no other way to stop mashing. You just have to stop mashing. Learn how to execute your moves. If you’re pressing several buttons that only require 1 button press, you just need to chill out and learn the proper way. I just hate being called a masher by people who don’t know what PLinking is.
If you’re pressing more than 1 button and know what you’re doing, it isn’t mashing.
If you don’t know what you’re doing and pressing several buttons that only need one button press, you’re mashing.
Old habits take a while to overcome but I wasn’t playing stick correctly until about 1 1/2 months into it.
Practice doesn’t make you perfect but it makes you a whole lot more effective than before.