@dave30th Another suggestion I have found helpful is to post an update to the crowdfunding platform, as well as to the other ways you are sharing it, and add the request that if you can't donate now, or have already, please share again widely, which is a great contribution in itself.
In my experience those appeals always generate new activity, as people are so happy to share, they just forget and are glad to have a little reminder. Anyone else on FB etc can also add the request to please share even if donating isn't on the menu.