Instead you need to find like-minded people who are willing to challenge their thinking.
It’s pretty easy to tell if your opinions are weakly held. Do you change them in the face of new evidence? If so, they’re weakly held. And this applies to not just the big opinions of the day, but all the way down to the mundane. Do you admit that your partner was right when they suggested you do more stretching before exercising? Or do you tell your coworker that they were right and you were wrong when you had an argument over documentation?