If you play genshin impact let's co-op im ar 45

I play Genshin Impact and I can co-op but, the only problem is that when I tried to join my sister's world, it said it was dangerous or smth like that. I'm guessing if your AR is too low to join that person's world, you can't join. Another problem is that I'm busy with school work. I mean REALLY busy! I really wish to co-op with you. And, obviously & unfortunately, I can't. Although, I do wish you to have a good evening, day, night, afternoon, morning, or wherever you are, to have a good day or life.