My world

I have a world which i spent over a year on. And ever since the new 1.17.0 update came i havent been able to start up my world cause it keeps saying "World cant sync to the cloud just now". Im really mad cause of all the time i spent on this and every method that i tried from looking on YouTube doesnt work. And im not planning to lose this world. So i dont know why my world just wont sync to the cloud. All my other worlds syncs up but just not this one that i spent so much time on.