The best advice I have is to practice writing proper prose in a stream of consciousness style. Try to not edit other than with the delete button on what you just wrote. At least, that's how I got to my kind of eloquence.
You know how people advise you to read you writing aloud to hear how it sounds? Phrasing, readability, etc. I think the skill I have that helps the most is being able to write cogent and speakable language from a stream of consciousness. Try typing exactly how you speak, errors, accents and local expressions all included. It's a skill, yeah. Turning your vocalized speech into internal speech into written language; you get to the point where you can produce written language that sounds like someone speaking naturally.
As for flow and getting a point across? Studying prose helps. Simple things like "shorter sentences make a punchier phrase" or whatever help. Having a written style helps also. I'm not exactly sure if any of this helps, but thank you for complimenting my eloquence. I've never felt particularly eloquent - but I do speak my mind and only my mind. Popular opinion and groupthink are for unoriginal people. Sure, you can hold a popular opinion, but you've also got to have a reason for it that you can express.
RIP BOZO