How do you know as a leader if you are asking too much of people?
Are your people burned out?
Burn out is either a result of what you are asking of people or a result of people's personal pace of life. If you want to know if you're the reason for the burning ask this question:
What's keeping you from doing this role (volunteering or your job) better?
If the answer is simply the role, than you have an issue as a leader. And if the role keeps coming up with people than you're waiting to long to make a change or finding a creative solution. When people lack the space or freedom to be creative or to be renewed than you are asking too much.