Upgrade or not, and what to do about root

[AC Question]

My note 3 is acting up and cluttered. I am not sure if i should upgrade, restore factory settings, unroot, reroot or what to do.

Firsts things first, i run 4.3 rooted. So..

-Do i upgrade to higher android versions?
-If so should i use odin, or unroot, upgrade, reroot
-Do i stay where i am and just factory reset, and setup from scratch

I want to hear opinions