Does suicide prevent falling into sin? And what is your advice to someone whose sin has recurred, who has weakened before it, who has repented and suffered, and who has considered suicide?

How terrible it is to even consider suicide, for it is one of the most heinous sins and greatest evils. The cure for your condition is sincere and heartfelt repentance. No matter how many sins you have committed, return to your Lord and do not despair of His mercy, for one who repents from sin is like one who has no sin. Strive earnestly in repentance and returning to Allah, and increase your performance of supererogatory acts of worship and obedience, for indeed, good deeds efface evil deeds. Beware of despairing of Allah's mercy.