Hey there D so I've been having some seedling problems myself and after looking things over i noticed the most severe problem was too much moisture in the soil. I havent had to water again and its been about 9 days, ive only been misting slightly and misting the cup that's serving as a humidity dome. So maybe see they're watered well, and then leave them alone, let them get some fresh air each day and some humid air each day, and make sure theres good drainage holes.
For myself, the more I tried messing with things the worse it got. I just needed time, good temp, and to take it easy on the watering. I hope they pull through for you, I think nature usually finds a way, just give it time. ✌️