Word for how much of a professional?

I am looking for a word which refers to how much of a professional someone is in a particular domain or endeavor.

For example, let's assume we're talking about playing the piano. The question might be

What is your ____ in playing the piano?

Possible answers may be:

I am a sporadic pianist.

I am a hobbyist.

I am a career pianist.

Expertise and proficiency (and synonyms) are not quite right. It's possible that someone who plays the piano infrequently and only as a hobby plays quite expertly. Someone can play the piano professionally but with limited proficiency.

I am open to different parts of speech. A neutral connotation seems preferable. If no suitable word exists, a term or phrase would be acceptable. I am considering "vocation(al) level".

After reading your comment, I am now aware that you are asking about a person's level of dedication.

You could ask,

What is your level of dedication to playing the piano?

It would be more natural to ask,

How dedicated are you to playing the piano?

The most natural way of asking would be the simplest,

How often/frequently do you play the piano?

I'm not sure ability is what you're looking for, as suggested by Edwin Ashworth. As you said,

It's possible that someone who plays the piano infrequently and only as a hobby plays quite expertly.

Hope this helps!