The very first thing I think of when I see TAG is Talented And Gifted, which was the name of the educational program my son was a part of in elementary school. I'd like to think I'm a talented and gifted proofreader/copy editor, but somehow that doesn't bring across what I can do for you, the Indie Author. It sounds more like a mother who is proud of her son!
I thought about using the Bookshelf Muse's Character Traits listed on their website. So, here is what the tagline could be:
Definition: given to the heedful anticipation of the needs and wants of others
Positives: Thoughtfuls are always thinking of others and trying to make others happy. Their selflessness makes them easy to like. They are often an inspiration to others, who see their thoughtfulness as something to be emulated. By nature, people who put the needs and desires of others above their own often exhibit other positive qualities: generosity, encouragement, a hard work ethic, and a willingness to do the jobs no one else wants to do.
Definition: having a desire to achieve a particular goal
Positives: Ambitious people are hard-working and determined. They don't give up easily. They often are visionaries who can see amazing futures while others only see roadblocks. Ambition requires great focus and single-mindedness that enables most people with this trait to succeed at their goals.
Definition: liberal in giving; bighearted.
Positives: Generous characters are fulfilled by bringing comfort to others, hoping to add to their happiness and satisfaction in a meaningful way. They are satisfied with what they have as they view it as 'enough', and hold a high appreciation for their circumstances and the important people in their life. Generous people are content, and derive pleasure through giving. They often make good listeners, and are very observant. If they see a need, they step forward to fill it to the best of their ability, rather than wait for someone else to do it. Generous people are charismatic and inspire kindness and generosity in others through unselfish acts. They see giving as being a duty as a decent human being.
But still, I'm not sure "Thoughtful. Ambitious. Generous." really helps anyone know what I can bring to their manuscript. Maybe "Timely. Affordable. Grammar Geek."
You guys are the writers - any ideas out there for me?