Hey all, new to these forums

I have lurked a bit and bought a Filco Majestouch-2 w/ Brown switches based on discussions here! Love the keyboard BTW and it's such a breath of fresh air after using crappy non-mechanical keyboards for so many years.
So, my question is how does one get faster at typing having already been typing the same way for many years? I am around 120-130wpm w/ very few errors in normal passages, but I saw a guy recently who did 163wpm average which was very impressive to me. More impressive is he averaged at around 120wpm doing very complex/random passages with lots of numbers, very rarely used characters, etc. It was at some typing convention/tournament.
Anyways, I'm 30 and gained the majority of my typing ability through using IRC every day during highschool/college years as well as in games like Everquest before voice chat was popular. The problem is I never learned how to type with the home row.. I learned via hunt/peck which is how I still type today except without having to look at the keyboard. I don't use all the fingers on both of my hands to type which I think is what's holding me back. I use all my fingers on my left hand but only seem to use my index finger and middle finger on my right hand

The problem is I'm so used to typing this way I can't see myself being able to change or whatever.. Anyone have any tips?
Thanks!