I coming I will help is a literal translation.
Most translations render Therapeusoo as heal.
Quite reasonable and sensible given the events described.
However consider this. Therapeuoo also means attend to serve care for like a servant at a healing shrine or a courtier or valet?
He's not just saying he will heal the official's son.
Jesus is saying he will give the man's son his personal attention.
And its after he makes this promise that then he lauds the father for his faith and trust in him.