I was doing the same thing to. According to my experience the only or so to say one that would really work is;
- Go on YouTube write Cryptocurrency/Bitcoin/Blockchain in the search tab
- Go to the profiles of the pages that appear in the top, navigate to about and contact them personally

Which is exactly what I did, should you need any help, contact me in personal, I will run you through or send you the price list of the ones that I reached out to.

Cheers mate.

Although, I am not really active over here, I can send you my previous work done should you still be interested