If you want to study one that is in a somewhat different vein, TCL will give you a broader viewpoint. Its syntax tends somewhat towards the LISP end of the spectrum.

https://en.wikipedia.org/wiki/Tcl

Pascal or Visual basic

It's a language I don't hear much these days.

What purpose is it used?

I still think that Classic Visual Basic 6 is the best tool to make a small app with a user friendly GUI that has a few buttons and you can distribute to end users and they can just click, be happy and think you are some kind of genius. Anyway, it's kind of dead :( , so I don't recomend to start with it now.

I'm still amazed how much I could do with a dozen of lines of PHP and Javascript, and make a simple web app, that I can deploy anywhere and my colegues be happy because I solver our problem.

(I never used Pascal (well, perhaps a hundred of LOC in total), but the old Borland Pascal compiler was extremly fast and good when it was released.)

Literally any other lang. lol

since u know (or will know) server-side...go for the rest: html, css, javascript

Did you dislike PHP? If no build a couple of projects in PHP first before learning another language.

No, I like PHP. I make some program.

The question is what do you want to do? Do you want to continue programing web apps in the server?

It's not my area, so you may look a better opinion, but i suggest https://en.wikipedia.org/wiki/Node.js and https://en.wikipedia.org/wiki/TypeScript