Have your youth group join/adopt another youth group from another city. The primary purpose is edification and and encouragement. Keep up monthly correspondence with your sister city through a newsletter, videos, pen-pal letters (you could match up each youth here with a specific youth there), etc. Lift each other up in prayer, share ministry opportunities, plan simultaneous events or Bible studies and then share the results, etc. If possible, plan a trip to meet up with the other youth group at some point.