It was my understanding that WA quests or worlds couldn't be reset, (though there is a possible way below). Some of the quests can be with mods, but not sure about the worlds. Other than moving to a new town and travel to the WA world from there. Or maybe save lots from a new save and place them back in your home world's Egypt, China or France.
I do want to add some more info, just in case it's useful.
Game Help:Sims 3 Reset Tombs
https://modthesims.info/wiki.php?title=Game_Help:Sims_3_Reset_TombsNeed help resetting travel locations
https://forums.thesims.com/en_us/discussion/217398Reset Travel Locations: (How-to)
Sim A traveled to China and went back to the homeworld. Sim B travels to China and wants fresh tombs. If you don't care for Sim A's relationships in China, if you're okay with those friendships or whatever to be gone, this is the easiest way to do it:
• Close the game.
• Go to 'Documents\Electronic Arts\The Sims 3\Saves'.
• Open your latest save file for this household. The save file looks like a folder.
• In there, you'll find a bunch of files. One of them will have the game of the destination world, with an NHD extension / file type.
• Delete that NHD file. Make sure you're deleting the one for the destination (example: Egypt, France, China) and not the one for your homeworld. If in doubt, make a backup of the save file / folder before making any changes.
• Go back to 'Documents\Electronic Arts\The Sims 3' and delete the cache files.
• Load the game, travel to the destination, and you should find that world has gone back to default.