Blair Singer argues that presenters (unless entertainers) should teach something useful and digestible: provide a small amount of actionable content, emphasize why it matters, and assign simple, repeatable practice. He illustrates with a golf-putting example to show focused instruction plus regular practice yields better skill improvement than overwhelming learners with too much content.
If you're going to present to people, it is my opinion you should be teaching them something, unless you're an entertainer. But for most of us, we want to teach them something. So have the mindset of giving them something of value that they can walk away with and make use of and adapt into their everyday lives as a result. Therefore, you don't need a whole lot of content. Too much content is not absorbable. People don't do anything with it. Spend more of your time telling why it's important and give them very little content. Think about it this way. If you're going to learn how to play golf, I could give you a two hour boot camp. Not me, but somebody give you a two hour boot camp on how to play golf and then you're good to go. Are you going to be good? Probably not. Probably not. But if we took one hour, taught you how to hold a putter and putt, and told you to go to the course three times a week for one hour and practice putting and that was it, would you get better? Of course you would. For two reasons. Your skill level would go up dramatically on that one. Item number two is you would.