Don’t feed the monster. Kill it.
You don’t need prettier slides. You don’t need fancy animations or most of the bells and whistles that are built into PowerPoint.
You probably don’t need to spend hours and hours preparing, if you’re already an expert on the subject.
Do learn the handful of basic story structures. Maybe throw in a few slides. Probably 5 or 6 max. They don’t even have to be that pretty. If you know your audience, they’ll love what’s on the slides. If you don’t, no amount of pretty is going to help you.