If you did find an organization that could use more funding that wasn’t already receiving funding from major EA grantmakers, you should recommend it apply to the EA Animal Welfare Fund and ACE Movement Grants (and Open Phil?). If it has already, but it was rejected, it may be worth finding out why, in case the grantmakers found it unpromising for reasons you’d agree with. If it does get funding, all the better, and you could still top it up if it has more RFMF or donate elsewhere.
If you did find an organization that could use more funding that wasn’t already receiving funding from major EA grantmakers, you should recommend it apply to the EA Animal Welfare Fund and ACE Movement Grants (and Open Phil?). If it has already, but it was rejected, it may be worth finding out why, in case the grantmakers found it unpromising for reasons you’d agree with. If it does get funding, all the better, and you could still top it up if it has more RFMF or donate elsewhere.