did all the elves leave middle earth

No, many elves still remain in Middle-Earth. Some elves chose to stay in their ancestral homes in the forests and hills, while others have found new homes in the Elven kingdoms of Lindon, Rivendell, and Lothlorien. Some elves have also ventured into the wider world, seeking adventure and new opportunities. But the elves of Middle-Earth still have a strong connection to their roots and traditions, and many still carry the same sense of beauty, wisdom, and magic that characterized their ancestors.