Someone somewhere set in stone the notion that a good presentation should have at most 3 main points. Try this math instead.
A good presentation makes a single point. That point is articulated in the very beginning. It is proved through facts and stories in the middle. It is summarized at the end.
If you do all of that and do it well, there’s a chance the audience will actually hear and remember it. If you try to convey more than that one point, they won’t hear anything.
One point. One.