Xbox One lost content

My kid has been spending their Allowance since this game first came out. They have spent hours, upon hours, upon hours and so much of their own money, to buy 63 dlc packs. Almost every big pack there was until the most recent. They only had a few left to purchase. They were going back on to get back into the game and had planned on purchasing the rest of the collection. Everything is gone and they are devastated and  frustrated beyond belief. The Sims has been a big source of their joy and a big part of their life, as they doesn't get out much. It might seem like just a game and no big deal, to most people, but they devotes a ton of time to all the intricate details and designs incredible buildings. A year before 2020 they became partly agoraphobic. The Sims is what kept them occupied and happy. Please tell me that there is someway to fix this. It's horrible enough that all their work has been lost, but to lose all the packs and content too, it's too much. We were really looking forward to watching them play the Halloween pack on Halloween. It's been something they have been looking forward to purchasing.