My suggestion is to bury it in a small coffin or find a box and bury it deep in the woods. I once had one but it was a joke voodoo doll or a faux one and it kind of did hurt when I stuck pins on it so I got rid of it.
I would take it apart and say a small prayer over it stating the person connected to the doll be released. I would do this by holding the doll and closing my eyes and visualize their soulleaving the doll. I would then take the discarded materials and the rest of the doll and bury it next to a tree. Trees feed off of energy and anything harmful or bad you did to the doll will be recycled into the earth and diminish. Always ask the tree to do this for you first and then leave an offering for the tree.
Please make sure you get rid of the connection of the doll before burying it please.