How can I upgrade my bathroom mirror?

Here's a post that might help - https://www.apartmenttherapy.com/frameless-bathroom-mirror-ideas-257890

You could put a frame around it or glue tiles around the edge to look like a frame.

Here are some Hometalk ideas here Sharon! Maybe these ideas can help you out!

https://www.hometalk.com/diy/s-bathroom-mirror-43966292

Here is one idea https://www.hometalk.com/diy/bathroom/mirrors/tiled-bathroom-mirror-frame-no-grout-8070759

Or more classic https://www.hometalk.com/diy/bathroom/mirrors/bathroom-mirror-framed-with-crown-molding-557653

A frame around it makes it appear more distinctive, maybe a ledge under it with a frame.

Frames can be made to fit (miter box) enhanced by stain or paint, embellished by using moldings that are more glamorous. Also they can carry on a theme you might have going on in your bathroom. Some have used rope for a more nautical look.

Here are some ideas:

https://www.hometalk.com/diy/decorate/mirror/framing-out-your-mirror-secrets-and-tips-29896457

https://www.hometalk.com/diy/bathroom/mirrors/diy-bathroom-mirror-makeover-for-under-10-26908594

https://www.hometalk.com/diy/bathroom/mirrors/how-to-frame-your-builder-grade-mirror-39877231

Would something like this work? https://www.frugalfamilytimes.com/2012/08/our-frugal-bathroom-reno-updating-old.html?m=1

Add a frame paint the frame stencils the frame