Brand Positioning, lead generation

I am building an online coaching agency

I want to help stroke patients regain hand movement in 90 days as a physiotherapist

the insurance in many countries pays the whole thing and in countries like the USA somewhere around 80%

The biggest objection I am getting is that they can have it for free

With my service I want to guarantee to them that they will get results otherwise they are going to get their money back.

(while the hospital is offering only treatment and arent focused on results)

So basically I will be helping paralysed people to move their hand again.

I want to connect to influencers in various domains, like (youtube, blogs, podcasts) as marketing and I want to build a brand as the expert on the matter.

I need help with positioning and figuring out my unique selling point in order to keep getting leads.

My way so far has been making posts in Facebook groups about stroke and I was thinking of doing the same in LinkedIn.

I want to be able to differentiate if a lead can afford my service or not.