Communicate with a lot more people. Improve your chances to have a better job and life style.
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My mother language is English which will serve me well when travelling the world. During my life, I have learned French, Japanese and Russian to varying degrees of competence, but could not be considered to be eloquent or highly articulate in any of them, however, I can travel the world with a reasonable expectation of making myself understood. I do not see any personal disadvantages in being bilingual other than the occasional confusion when hopping between alphabets and verb endings. I do not believe it is good for a country to be bilingual because, for example, all instructions issued from the government would need to be written identically in more than one language.