How to speak tactfully?

Use more modal particles: hey, oh, live, then, uh-huh, hey, hehe, pay attention. These words are lovely, but they are melodramatic if they are overdone. Be appropriate, don't use every sentence, just use ten sentences two or three times.

Laugh silly after a sentence, such as pouting, blinking, sticking out your tongue, making an embarrassing state, and paying attention to your discretion. Too much can be offensive.

One more word: please please! You are great, wow, you are great, please teach me, I will work hard!

Walking without following the routine, walking posture's lightness, jumping, small steps and so on, many of which are worth studying.