Yeah we just upgraded our babies pool to a 6 ft snap up. Kind of back fired because our drake just stands on the side and drains the water lol. We thought giving them more space and deeper water would encourage more swimming and diving but they don't seem to care lol. Maybe need to go bigger...
I'm sorry for your loss :(
That's what I would recommend. I know for my state of Michigan we have a rehoming page on Facebook for ducks and a poultry page. I'd check there first and see if there is something for where you're at.
It made be hard to find one that exact age but people do give...