I don’t mean to be the voice of doom, but I suspect you may have lost the roots to root rot. What I can see of the soil looks far far too wet. Sedums have really delicate roots, they’re very fragile and if it wasn’t root rot, the weight of the wet soil when you repotted it probably tore them off. The good news is they propagate (grow new roots) very easily. It’s clearly alive in the that photo so no need to panic. Just let the soil dry out completely between waterings - you should be able to push your finger into the soil and pull it out cleanly without any soil stuck to it.

If you’re not already, you should water it from the bottom not the top - stick the pot in the sink or a bowl of water and leave it for an hour max. Shake off the excess water before you put it back in the decorative pot. You won’t need to repot it again for at least a year - wait until the roots are growing out of the holes in the bottom of the pot. And you don’t necessarily need to buy new potting soil if you just have the one plant - just grab some gravel/small stones from outside. Rinse them thoroughly and push them gently into the soil. That lets the soil aerate and helps prevent root rot. You can poke a kebab stick or similar into the soil and give it a gentle wiggle to add air to the soil too.

When sedums get enough light their leaves are very close together and you can barely see the stem. At the moment it’s etiolated - it’s stretching towards the light and growing long and stringy rather than compact and full. If it ends up looking really odd after it starts growing properly drop me a message and I’ll talk you through how to chop and prop it. I’ve had more than my fair share of dodgy looking succulents!