I know how you feel.
I have had to turn down probably 10 kids since we started the adoption process.
Once we got a call for a sibling set 45min after T's adoption was final
We almost said yes but then relized it was too much for us to handle at the time.
I got a call for a special needs newborn when baby A was 5mo old. We said no because we felt his needs where too much for us to handle.
It is sooo hard saying no to kids who need a home but we cant adopt them all. (unless DH finally wins the lottery
)