I do think it will be tricky to get home educators to plug a paid-for service to other home educators. Maybe if you had a webpage then home educators could find you via google? Possibly something on Facebook though I have no idea what I'm talking about with FB because I don't use it.
Sorry but it drives me nuts, as the owner of a local HE yahoo groups and webpage, the number of people who want to offer tutoring services to our local HE group! I just delete all such messages. The only way a tutor of any sorts gets into our newsletter etc, is from personal recommendation by a HE family who has used them. When I wanted a tutor -only specific subjects such as music theory, never for ggeneric tutoring-I asked local friends for recommend
I don't know anybody who's mentioned any interest in having a tutor at primary level, though two of my friends use Kumon centres. Some of my friends use subject specialist tutors at secondary, especially post-GCSE.