I don’t think one should learn a programming language just because it is well paid. A programming language is just a tool, you can use it well or bad, to build or destroy, to make life great or miserable to your future self and your collegues — and your employer, I forgot to mention it…

But real life, alas, works like this: you choose your tools not just because they are the best to do what you want to do: you choose them because there’s someone willing to pay you to use them, even if they aren’t the best tools for the job — but, you know, everybody’s using this, or that, or that, or that…
Maybe that explains the success of certain languages and their ecosystems: nobody thinks to ask if they are the right tool anymore… At least, that’s so when the product isn’t, indeed, critically bound to such a technical choice, and hence market- and money-induced blindness don’t waste everything… Apparently…
Anyway, if I were you, I wouldn’t enrich my skillset just looking at boring lists of most paid this or that. It’s a dangerous path (maybe not for the wealth, but for the health of the consultants’ built digital world, it kind of is.)
Articles with titles like “Top N something” are almost click-bait. Be prepared to read BS — which doesn’t mean there isn’t some research and value in those words.
Well, do you really want to become rich programmer? Then, maybe the article Top 10 highest-paying programming languages in 2020 appeals to this secret desire.
Let’s see…