TL;RD I'm unsure.
I started programming in ColdFusion, when it was owned by Macromedia (remember "Shockwave"?), since then I've learned more than a few languages, both compiled and scripted, and I've always believed that every language has its time and place. C/C++ has been with us since always (maybe the "more experienced" devs can say "I remember when C was just a letter") and is still here because of it's speed?, reliability?, documentation?, Java for its portability, even Cobol had an specific orientation (given by the technology available).
Around 2002 I decided that I'd drop ColdFusion (no matter how much I love it) and make the switch to PHP, both Web oriented languages. But I'm also a sysadmin (maybe I'm a sysadmin first), I need to be able to quickly write a script for something, or a daemon for whatever reason, Bash and Perl were the selected languages for my sysadmin stuff.
I was very happy with that combo for quite a few years, I also added some ADA and Pascal at university, Java/C++ when I started my Mobile Development phase, then I met Python and replaced Perl completely. I don't really remember how many programs and systems I've made with PHP for web development and Python for server stuff.
I'm more of an old-school-sysadmin, I prefer stability and reliability for my servers, that's why I use Debian and don't particularly like Ubuntu for servers. Same goes for languages, I saw from a distance how Ruby dethroned Java/C/C++ as language of the year in 2006, then I saw it fall (It went from 11th to 15th according to TIOBE a the time of writing this post). Something similar happened when I learned about Go (I don't believe it's going to stick with us, no matter how much Google would like that) but I'm currently unsure.
Have you seen Rust's performance? I mean: wow.
Take a look at Rust. If you're interested on software to work and not get carried away by other secondary things, I believe you'll like it.
Anyways... my thought process at this time is this: I relly like PHP (I understand why you might not like it, but remember "a time and a place"), it gave the speed Web Development needed to develop the way it did, and not sacrificing too much in the process. Python is Python: pretty, fast, simple, and easy to read. I've been moving from server stuff to web (I love Flask, I hate Django) and it has proven for me a better alternative than PHP/CodeIgniter, so... now I'm faced with the question: Should I drop PHP/CodeIgniter, replace it with Python/Flask and learn Rust for the server stuff? I don't know.
I'm about to start a huge project, I know how I'm going to use CodeIgniter 4, the modules, the design, every thing is in my head, but I'm not sure to start with it, a gut feeling.
I'm not sure how I'm going to design the system in Flask, too many unknowns, but for some reason I believe it's better to make the switch...