Is my work in an accounting firm, whose clients are predominantly hotels and cafes that serve alcohol, and my responsibility for their accounts, considered aiding them in falsehood, and am I sinful for that? And must I leave this job?

It is not permissible to work in an accounting firm that deals with forbidden matters, such as alcohol, due to the sin and transgression involved, and it is a violation of Allah's saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression."