Did you ever consider that even if your professional expertise is outside of sales, that you are still a sales person? Many professionals frown upon the world of sales, equating it to taking advantage of people, but that is not how professional sales works. Sales is about uncovering problems and presenting viable solutions for a price.
I use my expertise to teach fractionals how to stay self-employed. Most of them are people who have no support from family or friends and lack the business skills required to create consistent cashflow. There's the problem and solution.
FYI, we self-employed professionals are all sales people. If you're in business, you're also in sales, whether you think you are or not. Somebody has to buy from you if you don't want to be someone's employee. Moving people toward making a committment to hiring you for your expertise, is sales.
Go forth and make no appologies for wanting to make a living in business!