Hmm this is a tough one. If I may ask, how long has it been since your last parrot?

I personally think you need to take your time. You need to see what has changed in your situation now and what has happened to the previous birds and how you are going to prevent all of it.

You learned from your first mistake, no more open windows. Accidents happen, I don’t know what the situation was but I’m sure you’re not gonna let that happen again. Third time however, bad breeder? What happened? Did you have any plans to bring him to a vet? What can be done to prevent this next time? Think very practical.

I am 100% sure your heart is in the right place for a birdie, and I don’t think you should blame yourself for their deaths.

Maybe you should take this time to grief, and calm your mind down. It is very tempting to just keep buying to replace. Think about it a little longer. First aid is a great thing to learn in general! You’ll have to find the confidence again in yourself.