Links in comments may not be passing you any SEO juice. Since comment spam is such a big problem for blog owners, most comment links are rel=nofollow.
Since your blog is very focused, I suggest finding other blogs and organization websites about Dyslexia or cognitive issues for adults. Then reach out to them.
Explain who you are and what you offer, and that you want to create a relationship with them. Offer to write a unique article on your topic or to profile them on your blog in exchange for a link. This is the best way to do natural link building. Given that your topic is scientific, you may be able to get backlinks from some really trusted .org or .edu sites.
