I would add:
Consider the scale of the issue (how many people are being harmed or killed by this problem?)
Consider the tractability of the action (how much difference will this cause actually make toward solving the problem?)
Consider the room for more funding of an organization (what would this organization do with more money?)
As a general rule of thumb, aim for the world’s worst off individuals
These are pretty basic but I think most mainstream social causes (e.g. Black Lives Matter, ALS Ice Bucket Challenge) fail to take these considerations into account.