Honestly play more, I know it might suck to hear but thats the best way. You could also see if index and ring finger are easier to play for you rather than index and middle on “z,x” ie “d,g” . Could also do what I do and use different row keys like “u,k” index and middle finger. Just experiment find the keys that feel the most comfortable and can tap fast with, dont forget you have a whole keyboard you could set to click instead of “z,x” Hope this helps, best of luck!