That isn't watermelon peperomia. That's peperomia frost. They actually like a lot less light. Mine is on the second shelf of a plant shelf and is about 18" from a grow light. It does very well and retains all its frosty color there. I sometimes ignore it for too long and it will wilt. Then I water thoroughly and let it sit in a saucer of water for 20 minutes. Then I dump out the remaining water and let it sit in the sink for a bit to make sure the pot has drained off before placing it back in its home.

I suspect yours is either getting too much light or possibly too much water. My suggestion would be to cut off all the ugly leaves. Also cut off all the inflorescenses because they drain energy from the plant. Then put it in lower light. Let it dry completely before watering again.

You might want to also try to pull it out of the pot to see how the roots look.

Hope this helps.

@popmama (Colorado, USDA z5) thank you!

I’m sure it’s the light, I dont overwater it at all. sometimes I forget and it goes limp. The roots look okay, they’re small/thin kinda like a tradescantia. I’ll try moving it a bit further away from the lights. it’s only about 12 inches below but I’ll move it to the side where it’s not directly below and see if that helps.

I just read some people finding the roots trapped in little mesh growing bags under the soil. But if you have checked the roots, then that's probably not it either.

Let us know what happens. It's always helpful to someone else.