https://youtu.be/uDqjIdI4bF4?si=dI-IA6GxHdRluh47
Watch all of it.
Practice animation(i.e. ball bounce)
Reference/study your favourite shots in anime, TV or any visual media.
You can do a lot with stick figures, so why are you limiting yourself by just animating characters in one position while they talk?
SerebetGM
There's a lot of ways to improve kiddo, you can do it :3