One thing many amateur mixes have in common is they are too harsh. For whatever reason young mixers like to boost a lot of upper midrange stuff to make their mixes sound exciting. In the end it only sounds painful.
Notching Out The Pain
There tends to be one or two main frequencies that are worth pulling back in your mix in order to reduce harshness and protect the listener’s ears. If you can avoid boosting this frequency that’s awesome. If you can pull some of it out, even better. Let’s take a look.