I know PHP very well - where to go next?

Question

Career in IT

It's been 6 years since I started learning PHP. For 3-4 years now I have been able to create sites of (almost) any complexity on Laravel and Yii2. I also know how to deploy a server on nginx + php/node.js. I feel like a fish in water in them and I get good money for me. In my life I am self-taught and do not burn with the desire to work in firms.
The question is: what's next? I've tried diving into the frontend, working a bit with vue.js, keeping an eye on ES updates, etc. But it annoys me that I do the same thing over and over again, which I did a couple of years ago. I want to go deeper into the backend. Something more low-level, but at the same time really useful and necessary. Advise where to dig.
It's not that I want more salary, etc. Just the brain requires something new. I've tried many languages ​​(Java, C++, C# ) - I'm not interested. I would like something like an advanced backend course. Some books, courses, etc. Simply put - where to go next in the backend?

Answer 1

Highload You
will immediately understand that you know nothing at all

Answer 2

I'll just leave this here

Answer 3

First, the PHP world is much wider than what you describe.
For example, can you work with PHP from
- RabbitMQ
- Redis - MongoDB - ElasticSearch
Can you write autotests? Can you deploy with Docker? At least one CI/CD? If all the answers are "no", then I can please you - your knowledge of PHP is not "very good", but mediocre, and the answer to your question is obvious. Secondly, If you know how to do all this, and want to develop exactly as a backend, my personal preferences are Go and / or Node..JS. I will not argue, but you need a ready answer.

Answer 4

increase salary ten times and see how many new projects there are

Answer 5

where to go next in the backend?

The whole problem is that

I don't want to work in companies

Answer 6

The question is: what's next?

Register an IP, hire programmers and manage them - do business in development, if you are really such a dock.

Answer 7

to the salary cap.
infa cell.

Answer 8

https://andreasbm.github.io/web-skills/