A correctly constructed phrase can give confidence and authority to the speaker.
To achieve the desired effect, you can only slightly change the usual expressions that usually have a bad effect on the interlocutor.
Several such examples can be given.

Some people, when expressing doubt, say, "I'm not sure this makes sense." But it's better to say, "This is what makes sense to me."
The second phrase eloquently shows that the speaker is confident in his opinion.
"Sorry to bother you with this..." is another phrase that has a more beneficial variation. It can be replaced with: "I need your help. Do you have a few minutes?"
The second option seems more advantageous, since the speaker is more direct and specific.
"Ummm, this is probably an awkward question, but may I...?" A more concise and clearer way to ask is, "My question is..."
Or here's another bad option: "Can you not talk to me like that?"
A more effective phrase would be: “I want to end this conversation because I don’t accept the way you are treating me right now.”
The second option looks more constructive and open. The speaker directly expresses his feelings and desires.
There are often situations when a person is forced to refuse something. "Unfortunately, I have to tell you no," is roughly what the answer sounds like.
And it shows that the person doubts his decision.
It's better to be more specific and not offend anyone: "Thank you for inviting me. I have to say no, but I'll let you know if anything changes."
And so you can rebuild any phrases. Thanks to this, a person not only becomes an effective and interesting conversationalist, but also increases his authority and self-confidence.