I had a map built and playable from when Creative first started, I got into the creator program last year. I accidentally archived that map then unarchived it, thinking it would be ok…well I go to my creative lobby and it’s not there anymore. It shows up on the website when I go to my profile in the Creator Portal…I just want my map back
Try this:
You most likely need to just re-star it in the content-service and you will re-gain access to your map inside Fortnite Creative.
Here’s the content service link: https://content-service.bfda.live.use1a.on.epicgames.com/
Firstly Un-Archive your map before going to the content service.
Inside there you should be able to see all of your projects, it should look something like the picture below, try to find your project and just click the star button.
Afterwards restart the Fortnite Client and see if you can now get access to your Island in Fortnite Creative