5th dnd – The soul of a dragon trapped in a protective ring of mind wants a new body; what magic could allow him to do it?

In my DnD 5e campaign, the characters fought and defeated a young dragon of white-and-silver lineages and found a spirit ring protecting his body. Without their knowledge, his soul has been preserved in the ring and is looking for a way to find a new body. She now chats with the new ring-bearer every day and tries to influence it so that she can regain her body shape. What magic documented in one of the rules books could allow him to find a new physical form, whether spells, magic items or magical phenomena such as a puddle of brilliance. Thank you!