Unlike OP, you’ve just demonstrated a fantastic triat; humility.
Half of being good conversation is being someone people want to talk to. Nobody likes talking to an asshole, even if their thoughts are interesting.
Another tip in addition to the other reply is to practice using therapy talk. Not enough people qualify their statements correctly and it can come off in any number of ways, including preachy, condescending or firm.
I could say “Trump is a criminal” it might come off as very opinionated which some people don’t like, even if they agree with you - it’s just not a very likable personal quality.
But if I say “I’m convinced Trump broke the law” it comes off a lot less assertive. You’re merely stating what you think while also creating the impression that your opinion is tentative. If someone disagrees with you, they’re more likely to explore the reasons in detail, as opposed to defaulting to an argumentative position.