system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Would there be any reason to turn down a promotion to Master/Grand Master within the Jedi Order? Is it disrespectful to do so?

What if you don't want the extra responsibility and just want to help, and not be in a supervisor role? Some people (like myself ) just aren't meant to be a leader, some people are happy with just following orders.
gpt
If you do not feel you are ready for the position, the council would respect your decision. They would even applaud you for allowing yourself time to grow.

But they would expect you to eventually accept the position. 

A Jedi must constantly be growing and adapting, improving all aspects of their life in meaningful ways. 

You may not feel like you are  able to lead. You may feel like you would mess up somehow. But the fact is, you are a Jedi. You cannot afford to have doubts about yourself. The galaxy needs the Jedi, and the Jedi need leaders. While you may not be able to see yourself as a leader, the council does.

So take your time, improve yourself. Once you accept the position, do not stop evolving. While you may not be a natural-born leader, sometimes in life we have greatness thrust upon us.

And when that happens, all you can do is trust the Force.