What does John 3:30 mean?

John the Baptist came to prepare people (Malachi 3:1; Matthew 3:1–3) for the One who is coming: Jesus (John 1:23; 3:28). Over time, as Jesus becomes known, more people follow Him than the Baptist (John 4:1). This is not a problem, at all. There's nothing wrong with the Baptist's message or his ministry. The reason he preached was to encourage others to follow the Messiah. So, when this starts to happen, he's happy. In fact, John makes an analogy to the best man at a wedding. The best man feels joy when the groom gets attention, and a bride (John 3:29).

The Baptist also knows that people cannot follow him and follow Jesus. If his message is working, people should be moving on from his ministry and becoming disciples of Jesus. This is the same situation Christian leaders find themselves in. The goal of teaching and preaching is to lead people to follow Jesus. At some point, those people should grow and mature until they are ready to make disciples themselves. The point of ministry is not to make the minister look good, but to help others in their walk with God.

Based on content, this seems to be the end of John the Baptist's statement. The next verse returns to John, the writer of this gospel, as he further explains Christ's supremacy.