Col 4:17 And tell Archippus, "Be sure to finish the task you were given in the Lord's service." Good News Translation
Too many people are looking for big things to do for God in order to fulfill their ministries.
Your ministry can be defined also as any task which you have been given in the lords service. If you are a member of a local church and you have been given a task to oversee the sunday school that is the ministry which the lord wants you to fulfill.