Go on God's schedule and by His grace, where and when He chooses. Plan to remain at the task as long as He determines, not as long as you may wish. Keep in tune with His Word and will for your life on the field. Dream big for your field and then pray and work to reach your goals. Remember that goals are really dreams with a deadline.
Missions is a mindset, as much as a geographical location.
Since all Christians should be involved in the Lord's mission, be Christ's missionary today, where you are. If you are faithful to His calling in your own small field, He may lead you eventually to even greater opportunities. In this way, you can become a messenger for your Lord in some location where Christ is little known. It is no easy road to follow, but there may be no nobler calling. It is dangerous and rewarding but it is the course followed by Christ and His apostles.