If you don't plan on sweetening then potassium sorbate is not needed before bottling. The only other additive that you may need to add is potassium metabisulfite, if you have not been adding that over the years period then you will want to add some before bottling to protect your wine from oxidization, if you have not added it up to this point I would add a 1/4 teaspoon to the batch and wait a month or so before bottling.
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