What programming languages ​​to choose? What DB?

Question

Database

Good day
There is a project:

The center of the whole system is the database. There is also an "executor" (script or program) that constantly performs the assigned tasks while working with the database. This very "executor" imitates the browser. It sends a request to the page (headers, get, post, json - a full bunch of data), receives headers and data (html or json) in response. It also works with web sockets (listening). The "executor" accepts large amounts of data, processes them (working with strings and parsing json) and puts them into the database. For the administrator, a special site is provided with which you can manage the contents of the database (roughly speaking, the DBMS).

What is currently implemented:

"executor" - browser + js extension + php
Control panel - html/css/js (i.e. frontend) + php
database - MySQL
OS - win 10
Server (assembly) - mamp

I'm going to completely rewrite the project (only the layout of the admin panel will remain untouched)
What programming languages ​​would you recommend using for each part of the project ("executor", control panel) for maximum performance ? What DB?
We don’t care about the implementation deadlines, but we don’t know which yaps - we’ll learn :)
I ask only knowledgeable people to answer this question (so that there is no such thing - “my yaps is the best because I want to think so and go to ***”) and opportunities to argue your answers
Just in case, I will clarify that the project is deployed on its own server
. Thank you in advance for participating in the discussion!