Just to put things in perspective, a .20 acre lot is a city sized house lot, perhaps dimensions about 100 x 100 feet, or some similar combination amounting to the same area.
There has got to be some relatively easy way to determine ownership of adjacent (or nearby) parcels. County assessor must have plat maps so you can determine plat numbers of adjacent parcels, then look up deeds for those to determine ownership--or ask the county "who owns x, y, and z parcels?". Then see if adjacent owner interested in a very cheap lot ($1 and other consideration) to consolidate with their own lot. By doubling the size of their own lot, they make their own lot that much more marketable for something other than token consideration.
As others have already suggested, offer it on Craigslist, reddit, etc., as a novelty "own a piece of Georgia land" type thing for some dirt cheap price. Someone out there will go for it just for the novelty, if the price is dirt cheap.