At a time when the cost of communication is getting higher and higher, the brave people who persist in learning languages are heroes/heroess in a pessimistic world.

At a time when the cost of communication is increasing /getting higher and higher, those brave people who persist in learning /who continue to learn languages are heroic in a pessimistic world.

At a time when the cost of communication is getting higher and higher, the brave people who persist learning languages are showing heroism in a pessimistic world.

At a time when the cost of communication is getting higher and higher, the brave people who persist in learning languages are heroism in a pessimistic world