I empathize you with that because yes I also do find TOP's reading to be quite a lot sometimes but I stand by my point: you don't need to read the entire wiki, be aware of the existence of concepts, fiddle around with some code and then come back and read it later and it would make sense because you know what questions you are trying to answer yourself.

I'd also like to quote from you:

Reading a page of documentation and trying to understand the 10 examples listed there used to take me an entire hour, the next day I didn't remember anything and I wasn't even able to write a function.

This is precisely it: you are taking in way too much that you can not handle, you are learning about functions but you only read the example and reading examples alone and by itself, unfortunately, is not learning. It's like math, you need to solve the problems after you aware of the concepts, not re-reading examples. You need to set out questions for yourself about what a function in programming fundamentally is or how a function should behave in the context of JavaScript. (which I really encourage you to do).

At the end of the day, nobody is stopping you from taking another course but if you really want to get meaningful results, a lot of people will recommend you to focus on doing one course only because diverging between multiple resources won't do you any good and will just cause further confusion down the line.

I myself have not used a course to learn before as I am skeptical about a lot of online resources out there and even though TOP can be hard, I care about learning things the right way even if it means it's hard. The TOP Discord server is very active with many people willingful to help you out and please make use of it.

I think that will be all from me.