One way we could answer this:
"Helping gardeners learn and apply year round care with over 30 years combined experience."
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I'm a supply chain consultant who has bought over a 10 million dollars worth of stuff.
The corporate credit card was so hot you could cut butter with it!
200 people came to me for answers. I gave them the direction, rules and encouragement they needed.
I struggle massively with this! Probably because my services and target market are evolving all the time, and it also depends on who I'm talking too. These are my current variations:
In terms of experience, I'll normally say how many years and combine it with something concrete. For example, if I was talking to something who wanted a custom e-learning / membership / marketing automation solution and they used Drupal as a platform already, I'd say: "I have 12 years commercial experience building custom Drupal solutions, I've written 2 books, have a popular education site teaching it, and have worked with XYZ (well known names) clients".
If I was writing it as more of a positioning statement, I say things like: