I learned a little APL & J, and enjoyed doing anything mathy or with matrices. I didn't like them for generic office stuff.
I read 3-4 books on Lisp and can appreciate the power of it, but somehow I've never really enjoyed using it.
Lua was a bit too barebones for me.
Odly enough, Tcl is where I felt the most comfortable. It's partly because it's a command language, but I also found it full featured and lightweight. I didn't like that there is no official distribution though. There are commercial options and things on sourceforge and I'm not comfortable downloading from them. Anaconda Python has an option to include the Tcl interpreter, Tk GUI, and Wish as Python has a wrapper around Tk.
J or BQN are both fine choices for an array language. I prefer J's ascii-based syntax, but it has some rough edges (e.g. namespaces) that BQN seems to have solved more elegantly.
Symbolic reasoning AI is mainstream, it was just never related to ML. The debate was between symbolic reasoning and machine learning in achieving AI. Somehow AI and ML eventually got equated in the last decade (in that ML became the dominant AI approach).
Symbolic reasoning lives well enough in things like business rules, we just don’t associate it so much with AI anymore, nor is it done with LISP.
More mainstream I'm wanting to learn TCL and lua.
I don't program professionally so don't need to learn anything to get a job.