Jesus ushers in the Kingdom of God, explaining to the crowds, not just the disciples, how it works. I do not think there was an “alter call” afterward. Jesus delivered the message and moved on. Chapters, in the New Testament, can be tricky.
And calling the crowd to him with his disciples, he said to them, “If anyone would come after me, let him deny himself and take up his cross and follow me. 35 For whoever would save his life will lose it, but whoever loses his life for my sake and the gospel’s will save it. 36 For what does it profit a man to gain the whole world and forfeit his soul? 37 For what can a man give in return for his soul? 38 For whoever is ashamed of me and of my words in this adulterous and sinful generation, of him will the Son of Man also be ashamed when he comes in the glory of his Father with the holy angels.
I suggest always peaking to see if it is “over” or continues. In this case, it was not over. In Mark 9, Jesus continues. “This isn’t pie in the sky by and by. Some of you who are standing here are going to see it happen, see the kingdom of God arrive in full force. Six days later, three of them did see it. Jesus took Peter, James, and John and led them up a high mountain.” So … think about it, the Kingdom of God has arrived and only 3 were there to see it.
Who can show me how? Jesus is the one. That is the clear message of the New Testament everywhere we read. Jesus is in charge. That must be dealt with in my life. Jesus is clear.
What is my goal? My goal is to follow Jesus. Every minute of every day. That is the job. It doesn’t change. The good news is that Jesus shows me how. I don’t have to figure it out on my own (like I really could).
The why and the how – Jesus tells me why and Jesus shows me how. I cry out, I do not know how. Jesus says, “I’ll show you.” And Jesus does.
 The Holy Bible: English Standard Version. (2016). (Mk 8:34–38). Wheaton, IL: Crossway Bibles.