How do I help my repotted, now welting, aloe plant come back to life?

Oh dear, sorry to hear that Sylvia. One of the biggest reasons why an Aloe wilts is because of over watering. Check if the crown is soft and appears rotten. If it smells yucky and rotten then it probably won't survive. If it smells okay you can still save it. Remove it from the pot and trim any soft, rotten roots from the root ball with clean scissors. The rotten roots will be squishy, try not to cut the healthy ones. REpot the aloe in a new pot with potting soil and water very, very lightly. Here's a great tutorial for caring for Aloes - https://www.almanac.com/plant/aloe-vera

Hello Sylvia, I was given a plant myself that looked pale and a bit limp and watered it a bit every day until it looked healthy again.

It should be treated like a cactus. so cactus soil and not over watered.

Don’t over water it only once every 3 weeks