How much do people make trading FOREX

Sadly a lot of people don't learn from their mistakes.

I think you got this backwards. Some earn huge money and many lost their money ;-) And not all depends on the strategy. Skill and mindset are more important than strategy itself. But overall its a combination of multiple factors.

The broker factor is very important as well. If you sign up with a scammer you'll lose your account sooner or later for sure. And sadly, scammers are ubiquitous in this industry, it's very depressing. For example, Chinese investors lost an average 20k USD per person to crypto scams last year alone. With the pandemic these numbers will get worse these year, because scammers love a crisis.

Most people don't make money at all in the long run. Yeah a lot of people get short term profit and but at the end they lose it. It because most people do not have any kind of discipline. They also can not control their emotions.