Or, "I say it all the time …."
Or, "If I've said it once, I've said it a thousand times …"
Or, "I've been saying it for years …"
First, you're making your audience feel not super special.
Second, you're unwittingly but convincingly confessing to being a gasbag.
And finally, maybe it's time to realize that whatever it is you've been saying nonstop since the tail end of the Great Depression—it's not getting through.
You should start saying something else.