speak germain perfectly

When I was little, I lived in Switzerland. I always used to speak German with my parents. However, when we moved to the area in Switzerland where we speak French, I lost all my German while I was learning to speak French. I would really like to speak German perfectly again, but now that I’m older, it’s harder to learn a new language. I’m actually taking German classes at school. But the level is not great, and it is taking a lot of time. I wish I could go back in time so I would have not stopped talking in German.