'arcfide is definitely right; don't think of it as the same as the rest of the programming languages in your arsenal. Fortran and ALGOL (which C, Java, Go, Rust, SMALLTALK, etc. are all derivative from) have almost entirely different approaches, and very little valuable carries over.
Approaching it sort of like you would a small Lisp isn't ideal/is a flawed approach but may get you closer: acknowledging it as a separate, distinct paradigm is pretty much necessary to get a feel for it. I think the easiest way to bridge the gap right now is probably learning a concatenative language, just because the resources for teaching those are so far ahead of what APL has right now (the best way I can think of to learn to use notation effectively is by reading one of Iverson's books that use J as notation or doing one of Iverson's J labs) yet still give you a feel for where the paradigm is headed.
Summary: give J's labs a try, they might help you get a hang of the paradigm better; KEI was a fantastic teacher, and Chris Burke, Roger Hui and Eric Iverson have done a great job in maintaining the old & making new labs, and if that doesn't work, try learning a concatenative language first and carrying it over.
Approaching it sort of like you would a small Lisp isn't ideal/is a flawed approach but may get you closer: acknowledging it as a separate, distinct paradigm is pretty much necessary to get a feel for it. I think the easiest way to bridge the gap right now is probably learning a concatenative language, just because the resources for teaching those are so far ahead of what APL has right now (the best way I can think of to learn to use notation effectively is by reading one of Iverson's books that use J as notation or doing one of Iverson's J labs) yet still give you a feel for where the paradigm is headed.
Summary: give J's labs a try, they might help you get a hang of the paradigm better; KEI was a fantastic teacher, and Chris Burke, Roger Hui and Eric Iverson have done a great job in maintaining the old & making new labs, and if that doesn't work, try learning a concatenative language first and carrying it over.