It will be difficult to find someone who is successful in forex trading, especially retail traders, because most of them are closed, or even if there are people who are considered masters in forex trading, it is usually possible to cover up their success to the outside world. Even if it is really successful, then there is another problem, namely how successful a person is cannot be measured objectively, so maybe one person will say he is successful while the other person is not.
Even if there are people who are considered successful, there may be one name, namely George Soros, who is considered an extreme investor, who brought down GBP in the Black Wednesday incident with other big players. In addition, he is also considered to be the cause of the Asian economic crisis which included Indonesia experiencing it in 1998. However, Soros also did not invest in forex, but in other investment products such as stocks. And he also owns a company to run his investments, namely Quantum Group of Funds. So if you are looking for an individual name that has been successful (really successful) from forex, it will be difficult.