Without a doubt, the most important part of a song is the vocals. It relates the message and communicates with the listener. Unfortunately, properly EQing vocals is often accounted for the problems recording engineers encounter. There may be times when vocals are buried under other elements, incomprehensible, or just upsetting to listen to.
Remember to always use your ears when mixing. When making major changes, stay within the context of the mix and don’t go overboard with the amount of EQ used. There are a handful of tools you can utilize to mold the sound of your lead vocals.
Read more about this here: https://sundownsessionsstudio.com/eqing-vocals/