Hope this is the place to ask this (from the description seem so); if is not can you pls. point me in the right direction? The question is rather personal but I guess other people may benefit from an answer too.
That being said: I'm a mid-life (around 30 years old) developer (a pretty good one imo). I had a good career so far. Started as a freelancer when I was about 13 years old (made some delphi desktop apps), learned C, C++, C# (but never worked professionally with them except some minor changes to couple of applications made by other people). Then I learned PHP, js and bash and started working professionally as a web developer (did this for the last 12-13 years or so). Also dabbled a bit in swift, ruby, python and tons of technologies and languages just for fun or for specific tasks (I believe there is right tool for each thing, not a "silver bullet").
This brings me to current day. I have a great salary, good benefits and a decent amount of free time. But my problem is... I don't think I can grow on my current setup any more (both financial and psychological - I feel my work became boring). I already earn about double as a senior php dev in my region and no matter how good I am no company would pay me 3-4 times the money someone else would ask for (if they did I would start questioning the company management).
I could go towards the management route (lead->software architect) but when I worked as a lead (two times, two different companies), even though it went well, I didn't enjoy it (I like coding, don't really like organizing tasks for other ppl, taking care of team mood, organizing meetings, evaluate people, etc. and definitely dislike not having time to code myself). So I would rather not do that.
Now the question: Industry changed a lot in last years. I feel maybe is time for me to also pivot towards new technologies. What should that technologies be? I prefer to remain in the web development area (is my comfort area) but if there are other sectors (like mobile software, research software, A.I., etc.) that could provide better opportunities I would give it a try.