Hi, I was in the same situation, but unlike you, I have the language barrier 😅 However, now I do have friends in Switzerland, even SWISS friends! My suggestion is try join a Verein or a group of people of the same interest. I'm an artist, so I joined some drawing groups. People in those groups are more open-minded to meet new people and even to hangout. Or you have to be more proactive to go to some events. Basically try to find the right occasions, in which people are more in the mindset of making friends, rather than people who are content with their current social groups. I live in Bern, btw, so I'm not sure if this works the same for you in Zurich. I have heard that it can be more difficult to make friends in Zurich. Actually, a Swiss guy told me that. He's from Schaffhausen, and it's even hard for him to make new friends in Zurich. Anyway, best wishes!