Our purpose now is the same as it was in the days of the first century church as they awaited the coming of Jesus: preach the gospel to the lost, bring back the wayward, take care of the needy, etc. Here is the difference between us and that first century church in waiting: we are no longer waiting and watching, but now confidently affirming that God has kept His word. Our goal remains to preach the kingdom of Jesus.
But God, being rich in mercy, because of His great love with which He loved us, even when we were dead in our transgressions, made us alive together with Christ (by grace you have been saved), and raised us up with Him, and seated us with Him in the heavenly places in Christ Jesus, so that in the ages to come He might show the surpassing riches of His grace in kindness toward us in Christ Jesus. (Eph 2:4-7).