How do you become a good commander?

We had it all, full nodes, competent squad leaders and all but the last capture point when someone was griefing the previous commander they quit the game right at our moment of triumph. I’ve only ever been commander once before but no one else took up the position so I thought I could take over for the easy win. Then everything just went wrong. All of our Garry’s were suddenly lost and we were on the back foot for the rest of the game. I went from a celebrated squad leader to a failed commander in the space of 30 minutes. You guys got any secret tricks I can try to learn from you? I don’t want it to happen again.