Most online lectures I watch were boring. Dry as toast. Dry like the Sahara. When I do online lectures, I try (to a certain extent) to make it a performance. Show enthusiasm. Make your voice rise and fall. Students are already gearing up a boring experience. Don't reinforce it.

Keep content relevant. Don't say too many words. Literally don't talk students to death in these PowerPoints. Make your words count. Try to be funny. If you're not funny, well, at least you tried. 

It's important to make your lecture material relevant to real-world applications. I often recall personal experiences in my clinical career to make the course content relatable. I try to explain to students how a theoretical concept could apply to them in real life.