If participants say you're cutting out or silent, test your audio in Settings → Audio with "Test Mic." A flat input meter points to a hardware or permissions issue; choppy audio usually means an unstable network.
Switching from Wi-Fi to a wired connection, closing bandwidth-heavy apps, and moving closer to your router all reduce dropouts. If only some people can't hear you, ask them to check their own speaker selection and volume before assuming the problem is on your end.