Seems to be more about holding chopsticks. But two ways to use chopsticks that might be less known:

Opening a bottle: https://www.youtube.com/watch?v=CPLrGfAbhnw

Also, I couldn't find a video, but at least in my Asian family, we will sometimes cut food like, say, an eggroll by using the chopsticks as a scissors.

Lastly, a chopsticks hack is that they are great way to eat food like buttered popcorn without getting your fingers greasy. :-)