So my guess is you are currently most effective in person, right? The good news is that once you have a certain communication method "dialed in" that is simply an opportunity to work on some of the others such as the written communication piece.
And just in case you're wondering, once you get that dialed in...there will be something else. That's the beauty of learning - we're never really done. It's an evolution but one that I hope you feel is worth the effort since you're helping students.
