What is the religious duty of one who lives in a corrupt environment and fears becoming accustomed to it, but tries to adapt to it to avoid hardship, while denouncing it as much as possible?

If you can advise those who engage in falsehood and gently and wisely forbid them from evil, while constantly disapproving of their actions, then there is no harm in associating with them. This is based on the Prophet, peace and blessings be upon him, who said: "Whoever hates it has disassociated himself, and whoever denounces it has saved himself." And based on the Almighty's saying: "And there is no accountability upon those who fear Allah concerning them at all, but only a reminder that perhaps they may fear Allah."