A lot of context lacks here. Is this in the workplace? In your life? As other commenters have said, sometimes being less opinionated isn't good. There are some

A lot of context lacks here. Is this in the workplace? In your life? As other commenters have said, sometimes being less opinionated isn't good. There are some core principles that you maintain strongly. But, if you really want to be less opinionated in a certain aspect, try to understand why would someone have a different opinion, in a compassionate way (that is, if your conclusion is "someone having X opinion must be ignorant/careless/evil" or something to that effect, you're doing it wrong). Usually, trying to put yourself in a mental situation where you'd have a different opinion will reveal arguments that you didn't consider before.