I found that one particular thing that helps preventing forgetting your native language(s) is reading. Specifically as I get older I rediscovered some absolutely great classical books in my native Hungarian, Russian and Ukrainian languages. Not only did it help me keep my vocabulary rich, but also helped me learn more about the history of my homeland and probably kept the bond alive.
Another thing that may be even more effective is if you have kids then use your native language exclusively with them. My son speaks perfect Hungarian for example, and it just warms my heart when visiting his grandma (who doesn’t speak English at all) I can see him telling her bedtime stories before going to sleep.
Another thing that may be even more effective is if you have kids then use your native language exclusively with them. My son speaks perfect Hungarian for example, and it just warms my heart when visiting his grandma (who doesn’t speak English at all) I can see him telling her bedtime stories before going to sleep.