OP when I started work, I had the social skills of a carrot, so have had to have more productive styles of communication dinned in to me over the years.
Presumably you are not opening your gob just to be heard - if you have, stop doing that, as you're wasting everyone's time, including your own.
Think first what you want to achieve. Then think, why? How did you eliminate other possibilities, why do you think this goal is a good thing? What benefits will come out of it?
Then let others have their say. This is a tip I got from a Steve Peters (eminent sports psychologist) book - people will listen to you much more happily if they have had their say and they feel you actually listened to them.
Bear in mind others come to the table with different knowledge and experience. What may seem obvious to you won't to them; and they may know useful stuff you weren't even aware existed.
Then you have to understand that we are all mammals. We have feelings, we work in groups, and they rely on a network of trust and reciprocity.
So when you put all that into action, to clearly and effectively communicate - you can still be direct, but it comes out very differently.
Instead of rushing to shout, "No, that's stupid" and expecting people (who may not know you or have reason to trust you blindly) to just go along with it...
You listen. You take in. And when your turn comes, or when it's clear you need to speak, THEN...
"I can see we need to get X done and people are leaning towards Y"
(demonstrate you paid attention and share the common goal)
"I have a different take. In my experience"
(you may have to be specific, eg mention previous projects)
"blah blah. I am also aware that"
(fact you know, and think is important, but nobody has brought up)
"and putting that all together, I have real concerns that Y is risky. Because "
(insert facts in favour of your favoured route)
"I think it would be safer to do Z. Is there anything I've overlooked though?"
(Shows humility and willingness to discuss with others).
Someone really good at their job knows how to put their case well so that TWO things can happen.
One, that the pros are clear to all. Two, that potential cons can be spotted and discussed without rancor.
It's a bit of a wall of text above, I know. But I really needed to have it all spelled out to me in detail (poorly socialized child, slightly odd family). And maybe you do too.