My 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)