Paint or white wash.

https://www.hometalk.com/search/posts?filter=paint%20fireplace

Do you have a picture you can share so we can see what you are starting with?

Have you considered painting your fireplace. We painted my daughters. Here is a post showing how we did it and how it turned out. https://lifeonsummerhill.com/how-to-paint-fireplace-bricks/

I always like the look of white-washed brick.

I love the look of white washed bricks: https://www.youtube.com/watch?v=KvuxOV3tGhk

Hi! Do you like white washed brick? I was watching a show today and they painted a brick fireplace a deep blue. It was absolutely gorgeous. Any color would work, really. Good luck and stay safe!

I think white washing looks much better on brick then painting. I like the fact that with white washing some of the bricks variations of color show thru. That seems to add more interest while at the same time lightening the area.

Hello. Paint could be a remarkable upgrade.

Fireplaces can be painted or often retiled and I find looking around at the visuals on Pinterest or Houzz might offer some inspiration and ideas.

Heres some ideas that I saved

https://www.hometalk.com/33847745/the-saga-of-the-truly-ugly-fireplace

https://www.hometalk.com/post/3373956/media?id=541608

https://www.hometalk.com/6384857/charcoal-grey-painted-fireplace

https://www.hometalk.com/39461004/updated-fireplace?

https://www.hometalk.com/27546793/fireplace-whitewash-project?

https://www.thisoldhouse.com/ideas/fireplace-face-lift-just-87

https://www.thisoldhouse.com/ideas/17-fireplace-upgrades

https://www.bhg.com/decorating/fireplace/styles/before-and-after-fireplaces/

The Saga of the Truly Ugly Fireplace

Charcoal Grey Painted Fireplace

Updated Fireplace

Fireplace Whitewash Project

You can whitewash or limewash for a more current look.