Hi Amy! I think the easiest way to makeover a vanity is with paint. Pinterest has tons of ideas to inspire and help you: https://www.pinterest.com/explore/bathroom-vanity-makeover/
Good Morning Amy, I just did mine. It was the ugly cheap wood look. I painted it with chalk paint and then added highlights with unicorn spit. I have not sealed it yet but here is a pic.
Sometimes just changing the hardware can drastically change the look. Or you can paint it. Clean it well, sand lightly and paint with a good paint. I like enamel for cabinets. Good luck!
I did mine on a tiny budget, you can see it here: https://thehoneycombhome.com/diy-cabinet-handles/