Make sure it has plenty of water and all your husbandry parameters are correct. Don't assume your parameters are right - check them and then compare them with the care sheet in this forum.
Do not touch your snake for the next seven days. Don't even offer him food.
Do not even look at him other than to check on his water and to make sure there are not waste products in there.
The more you mess with him, the worse you are going to make this. Your animal knows how to shed. All of your meddling and all of your "help" is doing nothing but stressing both of you out - so stop.