Why would you learn Esperanto? It's a failed attempt to make an international language and I don't know whether there is actually a community that speaks it natively; or to put it better, I am not sure whether there is a community that uses Esperanto as its first language. I am not sure where or when, but I heard that there are around 100,000 people who use Esperanto as their first language. This might not be true, anyway.
Remember that Esperanto is a constructed language, meaning that it is constructed up to a point and does not continue anymore. Also the number of speakers is destened to shrink year after year.
This of course is just my personal opinion. I don't see a valid point in spending time, effort and energy in learning a language you can't make use of.
If I had time and the necessary resources, I would begin to learn French or German.

I don't think it is quite difficult for someone of your age to learn a language. If you say it is difficult now, what are you going to do when you tern 25 or 30 and you want to learn a language. Your memory is fresh and is willing to absorb new things.
What you need, in my opinion, is a set of good resources which does not necessarily include online books or exercises. A good resource, when beginning to learn a new language as a blind student, in my opinion, is a braille display or braille books/materials. A language cannot be learnt by using your computer with JAWS or NVDA solely. You may switch to your computer only when you have acquired the basics of the language you're learning.
Each language has its own specific rules related to writing and pronunciation that you have to learn and acquire. A synthesiser reads in that language appropriately because it "knows" the rules and specifics; whereas when you use braille, you read yourself and "see" what you are reading.
I have suffered a lot while learning English, especially after I graduated from the special school for the blind in my country. Everything was carried out in braille. After I enrolled at a public secondary school of linguistics, everything went digital, that is, audiobooks, electronic materials, and so on. When I left the special school for the blind, my English was at around A2+ or B1 level. When I went to high school, not only was the pace of learning quicker, but the lessons were quite difficult. I wasn't accustomed to that pace of learning at all. My classmates, on the other hand, were quite used to that. Their English was superior to mine. What I hadn't learnt in primary school, I had to make up for in high school. I would sit and dedicate around four hours to learning English. Something my friends would complete in two hours, I was able to complete in four hours. One part of learning was examining how the new words I would encounter were written and it took time, of course. This was largely due to the lack of braille which I strongly believe would have helped. That's why I highly recommend you to use braille in the process of learning the language you like. Also, it is quite important to follow the right strategy for your age in regard to learning a new language.
One suggestion I give you when considering learning a new language: never base your opinion or consideration for a language on stereotypes like "it is difficult", "it has a terrific grammar", "it has a rough pronunciation", and so on. They are all subjective.

I know it has little value out in the real world, but I’m learning it to establish a few foundations and because it’s interesting.  And judging that I’m in high school, I’ll probably be learning Spanish soon either way. By the way, what are the seven languages that you speak?