I was president of my group but accidentally made someone else President, how can I get President back?

We already have an answer for a similar question which you can see here:
By accident I made my club mate president, how can I fix this?

If you have more answers to add you can do that below.

Fastest way is to ask the new president to give the presidency back to you. Some have successfully appealed to customer support, but that may take many days to a week.