Typing much faster than that is more of a gimmick you can brag about than a useful skill. I say that as someone who can type at 135 WPM.
As for actual advice, I couldn't help you - I learned typing fast by playing runescape.
Ask HN: How do I break through the plateau in touch typing speed?
11–12 of 12 posts
Re: Ask HN: How do I break through the plateau in touch typing speed?
#12My typing speed is about the same as yours. But since I started learning how to code I figured it would be useful if I could type faster.
I started using ratatype.com daily. If you're self taught you may not be typing optimally (used MSN messenger to learn how to type).
At first you'll obviously be a lot slower but eventually learning how to type correctly helped me get past that local maximum.
(This is all assuming you aren't typing the correct way RN)