It won't definitely have been seen by everyone, even if they've been online... but anyway, stuff like that is often unsuccessful. There are so many people asking for donations on social media that a lot of people just ignore all of them, even if it's made very clear it's for charity (as, I assume, yours does). If someone asks me in person, or in a group, I'd probably help out - but I blank every single FB charity post that I see.
And people are discouraged from interacting with it. If they 'like' it, that tells you and anyone else who looks that they've seen it and chosen to not contribute. It's far better for their 'image' to pretend they haven't seen it. So I wouldn't view it as a reflection of your own popularity, rather as a reflection of what people are like.
But, I think that if people see others donating, they'll be far more likely to donate themselves. So maybe it just needs someone to start things off and you'll see more of a response. Perhaps ask some people