Thank you very much for your efforts. Hestia CP defaults to installing Nginx/PHP-FPM served by Apache2 on the backend. I had to reset the server and set it up with only Nginx/PHP-FPM and FastCGI. Now it’s working with Redis after installing Redis and Redis PHP using the guide below.
I found the redis.so and copied it to the proper extensions directory where all the other modules are but still no luck. I restarted nginx and apache2.
I don’t. I have no idea how to install it. The Redis WP plugin works. There’s no instruction on installing Redis-php for Ubuntu 22 that works with Litespeed.