Truly, truly, I say to you, whoever believes in me will also do the works that I do; and greater works than these will he do, because I am going to the Father. – John 14:12 (ESV)
We have work to do. We do not need to do this work because Jesus came and did many works. We have great works to do because Jesus has gone to the Father. We need to do such works as Jesus Christ.
We continue in the works that He began through His earthly ministry. How? Just like Peter and the other apostles of Jesus Christ did. Just as Paul did so. Just as the early church did so. We need to continue just as Jesus Christ started.
Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:- Philippians 1:6 (KJV)