Your second sentence doesn’t follow from the first. Just because there is an enormous amount of suffering in the world doesn’t mean that you can’t alleviate a meaningful amount. The only way this is true is if by “meaningful” you mean as a proportion of the total amount of suffering, which doesn’t really make sense—the fact that others are suffering doesn’t make a good act any less good.
Your second sentence doesn’t follow from the first. Just because there is an enormous amount of suffering in the world doesn’t mean that you can’t alleviate a meaningful amount. The only way this is true is if by “meaningful” you mean as a proportion of the total amount of suffering, which doesn’t really make sense—the fact that others are suffering doesn’t make a good act any less good.
That’s only the case if you care about individual animals, as opposed to animal suffering in general.