Hello,
I think that you should add tags for all of your relevant skill sets, and list them in your profile, however you can create separate listings for services on Clarity. In your case, it might be advantageous to create separate listings for each category that you specialise in, all from the same profile.
In my opinion, the purpose of your profile is to build trust, expertise and professionalism within the fields you work in. The profile should state what you know and your experience without trying to convert a sale; the listings are where sales are converted.

Since i ones scraped a list of all topics here, feel free to go over the list and find the ones that suits your services.
https://pastebin.com/gfx2ajHv

Menashe Avramov Head of SEO @ https://www.mysticsense.com/