You don’t need the mic to move the crowd. Sometimes you just start walking and they notice.

Groups follow motion more readily than instruction, especially when nobody is sure what to do. Starting something visible resolves the hesitation for everyone else, and it works without permission or position, which is why it usually comes from whoever simply got tired of waiting. It also carries less risk than speaking, since an action can quietly stop.

When the room is stalled, begin the obvious first step and say nothing about it. Leave space for people to join rather than recruiting them. Most stalls are waiting on one person to move.