How to become more persuasive, eloquent, and sound confident in general?

How to become more persuasive, eloquent, and sound confident in general? I feel like it’s impossible for us, since all the word substitutes, replacements, and fillers make our speech less clean. I’ve found that I struggle in my career mainly because I sometimes can’t convey a message in a simple, understandable, yet persuasive way, and I sometimes prefer not to speak up at all. Unfortunately, this is not something I can avoid. I do a lot of data analysis and *have to* host meetings to deliver and present. Being in my 40s (like I should have achieved that years ago) and the fact that English isn’t my first language doesn’t help either. Any advice?