Learn another language
When children are growing up, they are at an opportune period to acquire skills which would take an adult decades. So it should be mandatory for preschools and primary schools to be multilingual. The only way to efficiently and effectively reach native level pronunciation is before the age of 14. After that, the brain cannot accurately replicate foreign phonemes without “immersion”. When a young child learns their mother tongue, it doesn’t take much to learn an additional few languages because at their stage of life, the child’s primary job is to learn how to communicate to prepare it for future life. Then the brain will absorb languages which are not part of the same family. On the contrary, for an adult to learn Basque and Korean from their mother tongue Russian, it will be a lifelong journey to fluency. Some will never reach the native level of thinking and pronunciation; many Polynesian languages have barely ten constants, so to learn English, which has almost 50 phonemes, sounds such as “j” [dʒ], “z” [z], “zh” [ʒ] are almost impossible to pronounce. “Luckily” these islands have been thoroughly exploited by the British, and many Polynesians are bilingual with English.