just give everyone their bankais already, have the characters fight the arrancar, but have something tragic happen that allows aizen to get away.
then a new arc, relating to the king. sado, renji, whatever the hell the quincy guys name was, and maybe rukia if she can man up v tosen, gin, and some other newly revealed enemy.
maybe they could lose the fight but zaraki gets his bankai w/ hollow mask, and his mere thought kills every enemy while they were in the womb. excpet for aizen. it is revealed that he was actually the bastard child of the soul society king and ...dunno momo or someone. he laughs triumphantly as he is about to get everything that the reader doesn't want him to and beats the crap out of ichigo. then someone is sacrificed (make it hitsugaya, just so fangirls cry). ichigo goes supersaiyan because its too late for the ripoff to even matter. he beats up aizen and teaches him its wrong to slaughter too many innocents. aizen repents and they all have a tea party. kon does something silly and is hurt for it.
then orihime shows up unaware of what happened because shes been leek spinning for years. she learned a new technique. it is too powerful and everyone dies. tone changes to ultra depressing. then it is revealed that bleach is actually the prequel to Elfen Lied and Hime is Lucy. then more crying. End.
dont worry, i love bleach, este es un chiste.
but really im surprised if you made it this far.