You can always stop paying the taxes and it go to tax sale. If they are totally worthless
Or you can look for the government or some sort of open space group to buy them as open space or park space.
Just a couple ideas
There is some property developer who as asked to buy them (sort of like the We Buy Ugly Houses people). I have no idea what they would pay, but my cousins and aunt who are in real estate and building in the area assures me that they are undevelopable. The contiguous lots are tiny, not on good ground, no water, or utilities, and none of that is about to change. In addition Santa Cruz County has imposed development rules that disallow new development unless you “win” in a lottery. And the square footage does not meet the county minimum. Basic permits are costing north of $200,000 these days before you even break ground.
My parents bought these lots more than 60 years ago as a site for possibly building a cabin, or retirement home. They cost me somewhat less than $400 per year in taxes, but I’m tired of paying it. The bigger liability is future road repairs and fire protection for the few neighbors that do live there.