i lost my world 2 days ago

hello, in August 25th, I lost my world, i had 3 worlds,  now only 2 now, and my great world and main world i lost, i had a lot stuffs in this world, like nether portal, farm, lot of chests. it is a great seed.

And this world (my main world) is not among the ancients to recover.

my xbox one world disappeared with update 1.53 and now with 1.60 impossible to break a block, im possible to play game now.

 

i just want it back, please.

tks. i love this game