Do what I can do to preach gospel

Acts 28:23-31
From morning till evening he explained and declared to them the kingdom of God and tried to convince them about Jesus from the Law of Moses and from the Prophets. Some were convinced by what he said, but others would not believe.
The Holy Spirit sure knew what he was talking about when he address out ancestors through Isaiah the prophet.
Therefore I want you to know that God's salvation has been sent to the Gentiles, and they will listen!
Two whole years Paul stayed there in his own rented house and welcomed all who came to see him. Boldly and without hindrance he preached the kingdom of God and taught about the Lord Jesus Christ.
What happened after this is not known. Most probably he was released, went to Spain as planned, and then back East before further imprisonment and execution in about AD 64-65.
Why?
Paul knew that Jews will reject gospel for the prophet Isaiah has said about this situation. So he boldly preach the kingdom of God and the Lord Jesus Christ.
Paul did not care the result of what he had said, keeping talking gospel.
We can not expect everyone accept Jesus as their Lord, some convinced some would not believe.
How?
Preaching gospel is our mission, but results are reply on the power and mercy of the Lord.