Your ability to teach your clients is directly related to how much you are willing to learn everyday.
The more you grow the more powerful you become, allows you to be more at cause over your situation.
The trick is this and most coaches do this and fall into the loop of imposter syndrome.
As a coach, when you learn you are growing, discovering new abilities about yourself. You cannot teach what you learned NOW but you should teach how you would solve your old problems with your new knowledge.
Remember your clients are you when you started with all the same problems and challenges you had when you started.
Your current problems and challenges are different to that of your clients.
When you get a eureka moment take that new viewpoint and apply it to your old problems, this was you will help your clients get results faster than you.