What makes an Advanced Witch
I keep seeing this come up on various blogs and realized I've probably been around long enough to volunteer an answer.
I think where people get thrown off in this is -witchcraft - which creates a muddle. So, I'm going to use other skills and crafts as a bit of a comparison.
Beginner witch - okay, we all know this one. You're new. You're still learning terms and how to do things and frankly a lot of it is confusing. Particularly "why" because in witchcraft, why is sometimes hidden in an historical tangle of techniques and reasons. In many traditions, you spend a year and a day at studies before being considered for more advanced studies. In college, this is the 101 level of just about anything.
Intermediate witch - you're developing skills and techniques and can follow a written spell or ritual. Think of learning a skill like cooking or sewing where you know enough to follow a recipe or pattern on your own but perhaps still need those instructions to get from beginning to end of a project. The "why" is probably even more confusing because as you learn more, "why" becomes contradictory at times. You probably do a lot of reading and talking to other witches to learn more.
Advanced witch - you now have a strong core of knowledge, skills and resources to write/create your own spells and rituals. And explain WHY you made the choices you made. You know you may never reconcile all the contradictory "why" in witchcraft but you've developed a "why" behind your own practice. (Even if it's a weird why, it's there.) So, in the Knitting Guild, to be considered a Master Knitter, after demonstrating all the basic skills, you have to design and knit your own pattern, explain the why behind your choices and provide resources to back up your decisions. It seems witches should at least be able to do the same.
"Master" witch - at this level, you should have enough experience and knowledge to be able to evaluate the work of others, identify strengths and provide advice on how to improve weak spots. This means you likely have a broad range of knowledge of different practices outside of your own. Now, I know this idea is going to freak some people out but in writing, this is essentially your professional editor, not your opinionated writing group critic. An editor likely has an advanced degree and goal to make the writer's work as strong as possible. In witchcraft, this is likely a mentor, teacher or coven leader in a structure coven. At this level, you're doing pretty well and have probably stopped worrying about what level you're at.
Professional witch - if you report your witchcraft income to the IRS, you may be a professional witch. Less a skill level than an occupation level. These are the witches who write books, take on speaking engagements, teach classes, do public rituals and the like. Before approaching this level, you might want to consider that at this point, you're writing, classes and work is going to be open to be reviewed and critiqued by the public at large. With most of the previous levels, you'll make your mistakes in private (or with small group). Here, you're going to make them in public and might want to consider that the public still hasn't forgotten the Irish Potato Goddess.
(I've purposely avoided using the terms like adept, novitiate, HP, and such that make be specific to certain traditions because then we just get into more confusion.)