Do you advise a believer to remain in the field of currency exchange and jewelry sales, or to leave it due to its sensitivity?

The regulations for currency exchange are stricter than other forms of selling. There is no harm in it if it adheres to the Sharia-compliant regulations. However, for anyone who fears that they might not adhere to these regulations, it is more pious to abandon it and seek a permissible means of earning that does not raise such concerns, based on the Prophet's (peace be upon him) saying: "Leave that which makes you doubt for that which does not make you doubt." Piety means abandoning what one fears might cause harm in the Hereafter.