Depends on what good means to you. 80 WPM and 100% accuracy is pretty good, that's where I'm at. If you want to improve, go with an accuracy mindset and try the gibberish letters from typing lessons and do numbers as well. I went from 80 WPM to 40-50 WPM because I'm not use to it. I will probably go from 40-50 WPM to 5 WPM if I try new keyboard layouts, but that is what makes you faster.
You don't need a alternate keyboard for fast typing, even if you see top typers get like 210wpm or something with a setup and a different keyboard. You can still be good without having to get all these things.