How do I brighten up a dull Formica countertop?
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There are re-finishing kits for countertops to make them look like stone (or you could just do a solid color). https://gianigranite.com/collections/giani-countertop-paint
If you just want to "restore" the finish, check out this website for some tips:
http://www.formica.com/en/us/advice-and-ideas/tips-6-great-products-for-restoring-laminate
Rustoleum and other brands make kits to refinish, if you're wanting to change the color.
epoxy! This is a great product and easy to use! https://www.stonecoatcountertops.com/