What does Ephesians 3:8 mean?

Honestly, I’m the least important of all God’s people, but he still gave me this job: to tell non-Jews about the incredible riches that come with the Messiah, riches that never run out. Ephesians 3:8 - Modern Text Bible

(Paul feels unworthy, but he’s been given the task of sharing the endless blessings found in Jesus with everyone else.)