Being less opinionated doesn’t sound all that great to me. Your opinion is the sum of your experience filtered by an idea. This distillation is the basis for your thought process.
Opinions seem to work in an almost bayesian sense: you have some opinion A and upon learning B you update your priors.
I’ve gone from basically shouting “you’re wrong” at people when I was younger to now I will listen to pretty much anyone’s seemingly wild opinion on anything. My curiosity has shifted towards learning why people believe certain things, seeing if they came to that conclusion rationally, and seeing if there’s anything I missed on the topic. You typically form new ideas even by hearing bad ones from other people. Seems to jog the creative part of your brain where we as humans are wired to be social and collaborate.
By understanding how other people think about things, it gives me a heat check on my own takes. It helps me form a clearer understanding of what motivates that person and where our irreconcilable differences lie.
Tl;dr have opinions on stuff, but most hills aren’t worth dying on. Listen to others and develop yourself and your thought process accordingly.