Strive to seek the entrance to kingdom of God

Luke 13:22-35
Strive to enter through the narrow door. For many, will seek to enter and will not be able.
Be hold, some are last who will be first, and some are first who will be last.
Blessed is he who comes in the name of the Lord.
Jesus laments to people of Jerusalem rejected gospel.
Jesus said to some Pharisees what will happen in next three days. Jesus must go on his way to Jerusalem. He knows he will perish there.
Jesus does not answer the question directly.'Don't ask how many'.  Just make sure you seek entrance to God's kingdom. Many will try, yet fail.
There will be surprises. Time is limited.
Jesus is not bothered by Herod's threats. He knows what lies ahead, and grieves at the fate of the city that will destroy him.
Why?
Today, tomorrow and the day following means very short time in Jews. Jesus has short time in the world, but he have to complete his works.
Don't ask how many people will repent and enter the kingdom of God, do our best to seek entrance to God's kingdom.
Someone heard the good news but they do not follow and believes in Jesus so they fell and could not enter the kingdom of God.
How?
Do my best to seek the entrance to kingdom of God.