I’ve been sending messages like “You seem lovely,” tailored to each person, to dozens of people, but I haven’t received any offers or messages saying “You seem lovely” back.

You’re still totally fine. I think it’s safe to assume that people who registered a long time ago and come on too strong are probably players. Rather than jumping at the first opportunity, just take your time and size them up（笑）

I think the usual thing to do is send a “You seem lovely” message to men who have added you to their favorites. However, even if a man has favorited you, he may simply not be ready to make an offer yet. It may just not be the right time for him. If you’ve only been registered for a week, I don’t think there’s any need to worry. By the way, if you’re a B1 woman and the staff comments say that you’re basically dinner only (no intimacy), you may not receive any offers.