If you make art, you need to look at the work of other artists. It doesn’t have to be contemporary work, but you need to look at art. You need to study what it’s made of. You need to teach yourself to see and to speak. To find the words for the different techniques that artists use and the choices that artists make. Then use those words to inspire your own explorations or to describe what you are striving for in your own work.
If you write, you need to read.
If you compose music, you need to listen.
If you make films, you need to watch them. Obsessively.