If money is your sole motivation and stack overflow is to believed you would be better off learning Clojure.
https://insights.stackoverflow.com/survey/2021#section-top-p...
Rust pips Go very slightly and C++ is near the bottom (I imagine because of underpaid and overworked game devs dragging the average down?).
I'd take the entire survey with a pinch of salt.
BFung's advice is decent. I would also add:
- What is a problem that lots of people have that you have the skills, willpower, time and creativity to solve?
If you want maximum financial payoff you're better off thinking about what is the maximum value you can offer to the world through problem solving and then select the appropriate language for solving that problem. And again, if maximum financial payoff is your sole goal, you're ultimately going to want to either own your own business or join the management/executive track otherwise you're probably going to hit a pay ceiling. So you might need to simultaneously study up on business skills depending on your existing background.
Another thing to consider:
If Capital by Thomas Piketty is to be believed, capital is growing quicker than wages. So would you be better served by taking time to invest your existing wage in a smarter manner than focusing on increasing your wage? I remember working in a coffee shop in 2014 whilst in debt wishing that I had the money to invest in shares in Tesla because I'd been reading about it and it seemed like a good bet. If I had maxed out all my credit cards and invested in Tesla stock I would actually be a millionaire right now because the stock has risen by over 3000% since then.
Obviously that would have been an insanely risky financial strategy but I think it illustrates the point nicely that maximum financial output is a pretty hard target to optimise for. Instead, optimise to add value. Most people find this a more rewarding path emotionally, spiritually and, as a happy byproduct, often financially as well. After all, a company's share price is, theoretically, a reflection of the value it offers the world at any moment in time.