Any advise????

I incubated 9 eggs for the first time all have died except one I'm holding on too because I saw movement at day 18 and today is day 21 no movement or peeping I'm gonna wait a few more days!!

This was my process and I'm sure I could use some advise on how to do things better

I used styrofoam cooler as I've seen a lot on here had thermometer that was steady at 100-102 except for 2 days about a week ago I woke up in the middle of the night during a cold snap and temps dropped to 95 it took me lots of tweeks during those two days to keep temps up and they averaged probably 97 then thinks got better and stayed at 100 humidity was hard for me to control and stayed around 45% the whole time and have increased to about 55% the last three days I have no more room for water the main thing I think I did wrong was have different due dates between the 9 eggs I had three different hatch dates all during the same week ?

I noticed during this last week almost every other day while opening to turn eggs a rotting bad egg smell I would locate the egg crack open this has happened with every egg except this last one when I open the egg it is all brown inside with bad smell and most seem to have only developed about a week old with one that had a few tiny feathers but had died at least 5 days before hatch day

I am using Eggs from my coop and felt that the sooner I get them in after being laid the better so I get about three a day