Good question. Users who seek help will primarily select an angel that's written a nice bio, so it's good that you make an effort.
We suggest that you make it personal and not too long.
Your age, situation, experience, interests and help areas are already available in your profile, so focus on describing what you've been through and how you've come to Angelchat to use your experiences to help others in similar situations that you previously found yourself in.
How it was, what happened, and how it is today is a pretty good format.