When Mother and I decided to be done with it, we put all our books in a box and dropped them off at the house of a brother and sister we liked while they were at the meeting. We had no idea at the time of all the lies the WTS told, just that there was obviously no holy spirit present in the religion. I regret now not keeping one or two of the items for comparison and research purposes. All I have now is my old NWT Bible and they have that available online.
From time-to-time someone will come on here and ask for a particular publication for research. You might offer your items individually or as a group for such people. You could probably use a site like ebay and just sell it for the shipping costs.
Or you could burn it all. I did that once with a lot of crappy old romance novels someone gave me. It was fun.