Hi King Cosmos,
I don't want to give a FFT lesson, but there are a lot of math behind the scene and you cannot do anything. It goes like this :
your signal is evenly sampled at dt intervals.
The maximum observable frequency, the Nyquist frequency is Fn=0.5/dt.
The frequency interval (distance in hertz between to points in your fft graph)is df=Fn/N, where N is your number of points.
So the x value of the first point beeing 0, the second is Fn/N, third is 2Fn/N etc.
So to get a better resolution, you have to INCREASE N, the number of points, or to reduce dt to reduce Fn, or both.
Hope this helps.
Pls rate if appreciated.
Doc-Doc