When someone books you to be their wedding celebrant they're expecting you at full energy, full-on, 100% of you, on that day. It's impossible for you to deliver that when you're tired, worn out, burned out, nothing left to give.
Before you archive this email:
Schedule a day off in your calendar.
Schedule a holiday in your calendar.
Schedule a social catchup with a friend.
Schedule time off so when you're on, you're at 100% energy.