It depends what kind of language we are talking about. For example when I was in Sanya, China, my Russian was useful to earn some money and even some respect from the local people. But outside of Sanya, I mean many other Chinese cities, there were not people who wanted to learn Russian or who care about Russian language, Russian culture and so on. In Haikou, Changchun, Maomimg, Zhangwu, etc. I I should only one student who learned Russian... In Cambodia so far the situation is almost the same. Hear some people like to learn English, French, sometimes Korean and even Cantonese Chinese, but when it comes to Russian they are no people who want to learn it. So my good Russian is practically useless. What about the "small" languages like Bulgarian, Macedonian, Tatar... Most of the people in China, in Cambodia and in many other countries don't know what are these languages and where are the countries where people speak this languages. So as you can understand, sometimes even as a polyglot, you will be valued the same as some person who just speaks one language like English. In some cases the one who speaks English may be even more valuable than you, because he's a native speaker.
I'm not saying that learning languages is useless. What I want to say is that not every language, not everywhere, is useful.
No about the TikTok. I'm trying it and I have got more than 1000 followers so far, but no income. YouTube is paying currently around 6.00 dollars per month.
About the Khmer language in Cambodia, of course it is useful to know it and it will make your life much easier. Only the rich people can stay here without learning it because they have enough money to pay to the translators and they can live here without bargain, without learning how to read, know and understand the prices because they just pay what they are told to pay. Some even give tips... But for the poor people it's not possible.
And at the end about the games, I think it's also depends on the game because playing chess for example is useful for your brain, for your thinking, and even for burning some calories. But if it's just a shoot and kill game, then maybe it's better to do something else.
And only one more thing, language-maxxing is very necessary for those who are not native English speakers. Only with English you're okay in most countries around the world, but without English you're in trouble.