Don't give up just yet!
Things go wrong sometimes and it's not nice, but it's how we learn. Hatching is not always moonshine and cute chicks, but when it goes well it's awesome. If I gave up the first time, or the second or the 3rd or the 4th or the 5th time I had a hatch flop or a chick dying I wouldn't have been here now talking to you. I've made such big mistakes in some of my hatches, I'd rather try to forget about them. Let's see if we can figure this out. I've got a couple of questions, if you want you can answer them and help us troubleshoot.
I'm suspecting there may have been a problem during incubation. Either the temperature was too low or the humidity was too low/high or something. That chick should've been further developed by now.
What was your temperature?
What was your humidity during incubation and lockdown?
Where did you get the eggs from?
How old were they when you set them?
Were they shipped or sourced locally?
As for the chick that hatched and died. What is your brooder set-up?
What's the temperature in there?
Were you feeding it and what?
Did it show any signs of being weak before dying?