Game Won't Open Old Saves

For the last week, my game will not open my old saves. At first they wouldn't even come up when I opened the game (even after I removed the original sims folder to my desktop and copied the save files in one at a time), but once I finally created a new game they would appear, but the icons would be greyed out. If I clicked on the saves, it would automatically open the new game rather than my old save. Including a screenshot below.

I've tried repairing my game, restarting my computer, and clearing out my computer storage and making sure all the saves were downloaded (not on the cloud). I've tried restoring older saves of my game, all to the same effect. I don't & have never downloaded any CC or mods. Does anyone have any tips? I would be devastated to lose my old saves--I've been playing on the same family for years!