I am familiar with all birds as we owned. Pet store when I was a child. But this is my first pet parrot. I love him even though he is quiet and kinda boring. He loves to cuddle and be with me.
Ok
Then I suggest getting a second quaker young one to be buddy with. It will give him a lot of support and quakers are very sociol. While all parrot's are , quakers really are they live together community and even have baby sitter.
This is just my opinion, for myself without hesitation I would add a second. Because even if not best buds there would be benefit for him. But you yourself must be well prepared to take care of 2 . Especially that is a big consideration for you and your ideas of sharing life with parrot's, especially as each will be their own self with their own needs . So what I'm saying is for the parrot I feel it would be good, but it has to be good for you too.
There can always be ones that don't get along. But adding a second young one I such social species....but all things need to be prepared for. As well as knowing this guy is young and quiet now that does not mean will always be so. And a newly added one is still adjusting.
Be sure to start sharing veggies! Offer a plate with some water in it and splash around see if you can start letting him learn how to take a bath . Use same words for things, and explain stuff to him
How did he end up blind? Can you share a picture of him?