Due to the limited size in xbox worlds, this idea crossed my mind. Some sort of rare structure with a portal or hard to get item, that when entered/used brings you and your inventory to a whole new world. You leave your house and other built things behind forever gone, but you keep all your inventory. So just grab all your tools, armour, gems and iron.
I already posted a similar suggestion of making a persistent inventory meaning your inventory would travel between all your worlds since our worlds are so much smaller compared to pc
or there could be another inventory called limbo that exists between all your worlds and can hold 2 large chests worth of items it would sort of be like how the ender chests are linked to one space between dimensions except limbo would function between worlds