Jesus said, "I will build my church"...
...by disciples "making disciples of all the nations".
How?
Making disciples happens a his disciples witness about Jesus in words, and come together with other disciples in practical, intentional, regular and local ways.
Discipleship is both making new disciples and maturing 'already' disciples.
Thus, witnessing of Jesus to unbelievers and being devoted to a local group of believers are both a part of discipleship.
So, every disciple practically should seek to evangelize unbelievers by going to them, and edifying other believers by gathering with them.