If they’re not worth any money, then the tax burden of sitting on them shouldn’t be high enough to be a problem. But if it is, you can sell them cheap, abandon them to government auction, replat them with neighboring cheap lots do make ag land or a large lot for an industrial or multifamily development, or more.

“I can’t make a bunch of money selling or renting this lot” is not an excuse to just sit on land waiting for the value to go up.