30 He lived there two whole years at his own expense,  and welcomed all who came to him, 31 proclaiming the kingdom of God and teaching about the Lord Jesus Christ with all boldness and without hindrance. (Acts 28:30-31 (ESV)
Thus ends Acts. It’s sort of anti-climatic. We don’t know what happens to Paul? Does he get acquitted? What? Does he go to Spain? What happens?
Acts doesn’t tell us. There are other sources that tell us Paul did indeed make it to Spain. He died in Rome after returning evidently. He is buried alongside Peter. Acts, of course is our most reliable source of information regarding the history of Paul and Peter, but a person would do well to read Eusebius’s Church History if they want the continuation of the story.
It’s hard to imagine that after all this Paul would lose his hearing. At this time the Roman government wasn’t hostile to Christianity. Though Nero would change that as he went more and more insane. But here you have Paul spending two years in his own home renting at his own expense. How he covered those expenses is not said. He preached the gospel though, that much we know, under guard in house arrest, but nonetheless without hindrance.
He spoke it boldly, and it took root.