Peter could speak credibly about persecutions because he endured them himself. He practiced what he preached (1Pet 4:12-14).
In Acts 5 we can see how he suffered for his faith. Acts 12 reports his imprisonment. Eventually, the Romans crucified him upside down instead of right-side up.
Sometimes a leader’s job is more difficult because the followers do not cooperate.
Read (1Peter 5:1-2) and compare to John 21:16.
Notice the growth Peter had made as a leader.