I think the splash page need a review by a third party designer. can you get someone on a freelance site to refresh it? I think the spacing is not correct in the bunny and the button. Probably moving the bunny to the left and pushing the title off.
I think the page looks professional, but there is something about it thats not OK can't put my finger on it.
I think the contrast in the yellow bar is wrong. it stands out too much. I would move the content of the bar right bellow the title and remove the yellow background.
I read some design stuff about Content, Repetition, Alignement and Proximity and helps a bit. specially when we look on a page too long and can't see the issues anymore that are apparent to new users.
I think your pricing is wrong, you should not use 5$ its a well known marketing thing.
I would bump it to 6.99$ to new subscribers its probably your optimal price. Or 4.99$ but i think people would pay for it all the same at close to 7$.
Your best marketing tool on the internet is a blog. This gives google a lot more to work with to index your page. You are passionate about the subject I'm sure you would write great posts that would hit front page.
The blog should be on your domain readlang.com/blog. check if ghost.org supports that otherwise go for a subdomain blog.readlang.com, and make links in both directions. Don't put publicity on the blog, it would like allow competition to advertise. Put a home made add to your own product.