"In my not so humble opinion" is a phrase often used to express one's opinion or belief on a matter. However, there are several other ways to convey the same sentiment without using the same phrase repeatedly. Such alternatives include "in my view," "to my mind," "from my perspective," "as far as I'm concerned," "personally speaking," and "in my estimation." These synonyms enable individuals to express their opinions in a less repetitive and more succinct manner, while still conveying the fact that the opinion is their own, even if it may not be widely agreed upon or considered humble.