Did you placed your peperomia somewhere in medium to bright light?
Did you planted your peperomia in well-drained, acidic soil?
Did you provide a warm and humid environment for your peperomia?
Do you allow the surface of the soil to dry out between waterings?
Do you fertilize your peperomia?
Do you repot your peperomia frequently?
Do you keep your peperomia free of pests and diseases?
Peperomia plants need a medium to bright light to maintain their vibrant foliage colors. Morning light and filtered light is fine, as well as 12 to 16 hours of artificial light. Insufficient light will result in fewer leaves, leaf drop, and drab coloration.
The soil required by peperomia must be chunky, loose, and acidic. An orchid potting medium works well. Regular potting soil is fine but you should lighten it with a handful of peat moss or vermiculite.
As tropical plants, peperomias like it warm and steamy, especially in the summer months when growth is most active. You can place it on a tray of pebbles and water to increase ambient humidity.
The succulent leaves of peperomia plants indicate that the plants don't need frequent watering to maintain vigor. Allow the surface of the soil to dry out between waterings. Keeping the peperomia on the dry side is better than saturating it, which leads to root rot and fungus gnat problems.
When it comes to fertilizing, less is more for the peperomia. Discolored or dropping leaves are usually a result of inadequate light or excessive watering, not poor nutrition. As a slow-growing epiphyte, the peperomia can go its entire life without supplemental fertilizer, getting what it needs from its planting media.
Peperomia plants may live for years in a relatively small container. They enjoy being somewhat root-bound, so do not repot them until you see roots coming out of the drainage holes. Repot in a slightly larger container with an acidic potting mix or orchid bark.
God job! You are taking good care of your peperomia.
The most common disease to afflict peperomia plants is Pythium, which causes stem and root rot. This is probably the most serious disease that peperomia encounters and can very quickly cause the death of a previously healthy plant. Pruning the affected parts of the roots and plant and repotting with new pot and potting mix is the best hope of rescuing the plant. Peperomia is fairly resilient to pests, but can still be commonly affected by fungus gnats, mites, and mealybugs.
https://www.thespruce.com/peperomia-plant-4584414
https://smartgardenguide.com/peperomia-plant-care/

Sreten null
Hi! I’m Sreten Filipović. I graduated from the Faculty of Agriculture at the University of Belgrade, with a master's degree in Environmental Protection in Agricultural Systems. I’ve worked as a researcher at Finland's Natural Resources Institute (LUKE) on a project aimed at adapting south-western Finland to drought episodes. I founded a consulting agency in the field of environment and agriculture to help farmers who want to implement the principles of sustainability on their farms. I’m also a founding member of the nonprofit organization Ecogenesis from Belgrade whose main goal is non-formal education on the environment and ecology. In my spare time, I like to write blog posts about sustainability, the environment, animal farming, horticulture, and plant protection. I’ve also published several science-fiction short stories.
You can find me on LinkedIn at https://www.linkedin.com/in/sreten-filipovi%C4%87-515aa5158/