Are you sure you have enough experience? Are you sure your coven is experienced enough? Are you sure you can handle anything that comes your way?
The realm of the occult is so far deep and many things can happen, some things can even cost your life. What happens if you forgot to close the circle and a portal opens (Yes, these things happen), Do you know what to do in the situation? Consider the burden and the responsibility of being in a coven.
Think about all the people you would have to take responsibility of. Remember, when your coven mates are in trouble YOU are the one who they will ALWAYS seek help from. Make sure you have enough knowledge, experience, and passion for magick so that it lasts.
Just know, that whenever a member of the coven gets in trouble the High Priestess is usually the person who answers to it. Are you sure you have the ability to carry these burdens?