Author, and Jasmine will give Itachi a drop of blood of an Evil God who will create new channels inside Itachi, but will not destroy old ones, but will unite with them thanks to Universe inside Itachi, and a special thing /being? This will increase Itachi's power level, and will allow him to absorb seed of the Evil God to gain control over elements, and full immunity to them. Itachi can also study the Great Way of the Buddha, which will strengthen his physical body even more.

Author, is it possible that Itachi will awaken Rinnegan and Rinne-Sharingan in future?