So some of my suggestions will not work for you, based on information you did not previously share. No biggie, and not the end of the world. You got me by a few years, but not many, and yes it is summer here, and yes it snows here to. Still not the end of the world.
So you sold the equipment, doesn't matter to the value of the property as a commercial operation as opposed to a residential property. Equipment is not real estate. You need the value of the real estate to be more than the loan amount. Something must exist in your neck fo the woods where the remaining buildings that are not the house contribute to the value more than neighborhood barns. Even hunters and trappers need a space to dry pelts, but with a commercial building, they may be able to process there also.
As you note, I'm not in your neck of the woods. You are the property owner and the expert on the area and the property. Put your good brain to work to find a use for your property that is more than just a house.
Even if you list it for sale on the internet at more than what's owed, Sell up that there is a manufacturing building, but no equipment. At least you'll get market reaction and not the opinion who some residential appraiser 100 miles away.
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I put it on zillow and for sale by owner for 9 months. For 3 months I had my google adwords management team link the ads with a nationwide adwords campaign for anyone searching for property in Montana. We got thousands of hits .. no inquiries, not even one! The sale price was $299K .. I would have made up the difference from my own pocket just to be rid of it. I have tried to rent it to local farmers but they already have barns and such. I have tried to rent the home for $500 mth.. no takers. Hunters are only here 2 months of the year and airBnB would only get 1 or 2 stays a year .. not worth the work. Doesn't help to have jerks on the board .. Thanks Marion .. be well .. I am done here