How to keep people from talking over one another

It’s been getting to the point that I now have 8 characters, happy and playing together. The problem is, due to lots of yelling we get approx. 1/4 of the stuff we’re supposed to get done per session done. What are some good ways to regulate them to stop yelling and talking over one another besides establishing out of combat initiave or a squirt bottle?

We are playing virtually and in person- discord is much easier to mute/unmute, so just help physically please