My professor constantly criticizes my work. She calls it heavy. She thinks my vocabulary is too difficult, "hard to understand" as she likes to call it. But thats my style. I like when you have to read between the lines. I like when I give the reader more

This is actually a very complex issue because you have to balance being true to your own writing and actually taking on advice. Writing simplistically isn’t average or mediocre, sometimes it is actually, a lot more effective than filling a piece with unnecessary and long words. Sometimes a reader doesn’t want to have to jump through hoops to understand something. Sometimes they want to just read something as it is. That being said, you also have to balance your own style. Maybe try something new? You might find you like it.