If you're ok with saying, how are you planning on having Yuna transition to Bleach? Will she reincarnate there similar to how she ended up with Naruto or will she go voluntarily, maybe figuring out how to recreate how Kaguya's ancestor ended up moving worlds. I think if she figures out how to go herself she could use the Naruto world as a sort of base camp while going to other worlds to mess around in. Maybe "infecting" other places with the Uzumaki clan would be funny as well.
I am not a big fan of fanfics and I don't usually read them but I had to make an exception for your story. Congrats on finishing the story. I really hope you end up doing bleach next, a Yuna vs Kenpachi Zaraki will be legendary. Actually is it safe to let those two battle junkies meet?
And so it ended. Feel as great as I feel sad. But knowing the whole ninja world get caked, I feel somehow satisfied. I don't know what you're going to do after the omake but I hope the BURNING FLAME OF YOUT*cough* the flame of the writter is still burning inside you. This was the best fanfic I read and a great adventure for the last year and half, and I only one word is left in my mouth after all of this: MOAR🦁