You might recover it with a splash of white spirit, a warm place for a few days and a good shake. I had a tin 1 year old which went waxy, kept in garage which gets cold in winter. I have another tin now kept indoors which is fine after a similar time.
I always find it goes solid in the bottle. Someone told me I should decant it into a smaller container and fill it right to the very top so there is no air, but found that also went solid in storage so now just buy an approximate amount and bin whatever is left.