When you see a careers advisor, it will have been good to have done some preparation.
What initially attracted you to teaching? What did you think it would be like?
Were there any bits you did enjoy? Think about the subject itself, planning, working with children, whatever else.
What has put you off? Bureaucracy, lack of time to yourself, the children, whatever else.
What was it about administration that made you want to leave?
What is it about admin that makes you now feel it's better than teaching?
What things would be important to you in a job? Think about flexible working - hours or ability to work from home, money, responsibility, predictability, commute, autonomy, working with others, working alone, variety, problem-solving, talking to people, planning, decision-making, creativity, processes, using your hands, indoors, outdoors, active, desk-based... and lots more things that go into making up a job.
Focus on things you really don't want, things you really do want, things you just don't know about. Don't think about job titles at this point, but the actual things, tasks you want to do - and really don't want to do. Obviously most of us have to make some compromises to pay for a roof over our heads and food on the table, but if you're doing something which is full of things you hate and none of the things that make you feel good, then the balance is all wrong. And if you're going to talk to a careers advisor, it will help to have identified some of the ways you are out of balance job-wise now.