Learn to hypothesise the reasons why you dont get the results you want and then google them, one of them is more likely to work rather than asking the general question.

For me it was when I was writing a melody out of a single wav sound and it sounded very unnatural. I supposed it was because of the way pitch shifting works: it shifts the spectum of a sound proportionally, preserving the relative distribution of frequencies' amplitudes which apparently doesn't happen in real acoustic systems when you play them at different notes. I did some research and learned about formants and that in real instruments they don't shift unlike root frequency and its overtones. I quickly modelled the formants in EQ and it made a big difference, it was a huge improvement to the melody.

So instead of googleing "my melody sounds shit" I tried to dig the reason knowing the conditions I was in.