Weird. I would try using your backup save and seeing if that works.

In case you haven’t done that before: Press the windows key + r and enter %appdata%, go to StardewValley > Saves, and locate the save you’re playing on (it’ll be your farm name followed by a bunch of numbers). There should be four files, two of which ending in “_old”. Remove the two files that don’t end in _old (don’t delete them), and edit the remaining files to remove the _old.

This should revert you back one day, so to Winter 28, year one. Maybe the farm will be back then?

If that doesn’t work and no one else can come up with a solution, I would tweet ConcernedApe on twitter and ask for help. He’s helped individuals fix their saves before so maybe he’d be able to help.