To ADCs when I'm playing tank and commiting to peeling for you, a tip
Focus what I focus, even if it's the incorrect play. Because if you do not focus what I focus, you often times end up chasing or kiting too far away from me to protect you. Peeling might seem like it's done by one champion but in actuality it takes both the peeler and the champion in need of peel an understanding of positioning and focus to peel and kite (or even chase) properly. I cannot tell you how many times I have peeled for a carry only for them to run off and chase the 5% hp support fleeing from the fight as opposed to continuing on my lead and then they extend out of my reach and die.
This doesn't just apply to tanks either, I almost exclusively play to peel then help clean up on every fighter I play. If you want Elo, peel for your carries. And carries of you want Elo, follow the lead of your peeler.