I think I type wrong.

I spend most of my time typing, whether at work or at home, so I figured some dedicated typing practice would go a long way.

Right now I seem to be consistently at 55 wpm with 97% accuracy, but I realized that I type almost entirely with four fingers; my index and middle fingers. (I still use my pinky and thumbs for shift and space respectively)

Is trying to learn to use all my fingers worth it? Rewiring my muscle memory would set me back a good bit, I'm just curious how much of a limiting factor that would be.

Also, what would be a good way to force myself to type "correctly" when I have been typing with four fingers for years? Are there any resources for this that aren't too mind-numbing?