I can never convince somebody to use bitcoin currency because of the risk involved, but there are other things you can convince others to do, not bitcoin. Bitcoin, on the other hand Is where you put your life savings money/funds in the hopes of making a profit, what if you convince them and things don't workout as you told them.? All I can do for someone is teach them about bitcoin, how it works, and the risks involved in it; if you try to convince them, they will not even listen to you, which is a waste of your time.
The only method to transform their negative opinions about bitcoin to good ones is to educate them about it; however, you must be informed about what you're teaching to prevent giving them inaccurate information.
I don't think you are responsible for changing someone's mindset towards bitcoin, especially when they are skeptical of it.
There is no point in convincing them, educating them, forcing our point of view to be accepted and whatever. They will remain skeptical of bitcoin because they are not inherently people who like decentralized financial systems.
I tend to think of saving more energy for more useful things rather than changing the mindset of someone who is skeptical about bitcoin. There is nothing to argue about because in most cases they will not change their mindset for a long time and continue to insist that their point of view is correct. Let me say, leave them in a centralization corner.