3 And I did cry unto this people, but it was in vain; and they did not realize that it was the Lord that had spared them, and granted unto them a chance for repentance. And behold they did harden their hearts against the Lord their God.
Avoid comparing yourself to other missionaries and measuring the outward results of your efforts against theirs. Remember that people have agency to choose whether to accept your message. Your responsibility is to teach clearly and powerfully so they can make a correct choice. Some may not accept your message even when they have received a spiritual witness that it is true. You will be saddened because you love them and desire their salvation. You should not, however, become discouraged; discouragement will weaken your faith. If you lower your expectations, your effectiveness will decrease, your desire will weaken, and you will have greater difficulty following the Spirit (“What Is My Purpose As a Missionary?” Chapter 1 of Preach My Gospel)