While it can and has been done (girl proposing to a guy) with the beautiful example of khadija
a and rasulullah
i just wouldn't recommend it for sisters these days. if you must go through friends or a third party, but don't approach a brother yourself. just some general advice. i think it's just something about guys today that turns them off when a sister does this. i mean it's up to you, but that's what the sisters of my circle have noticed/experienced.