good advice from sxpoet regarding taking those semi steps down push more air through.
I will just add that E and D aren’t terribly low so if you’re having a lot of trouble there it may be that your sax has a leak so I’d make sure of that first to avoid more aggrivation.

One of the very first automated emails I have send out whenever someone joins this membership is regarding this very thing about making sure that your horn is in good working condition before you dive into this thing. Why? because even a minor pad leak can make certain notes almost impossible for any player to get let alone someone who is just staring out. So, making sure you have no leaks will at least put you on even and fair ground. If that’s the case you can get past your problem of hitting those notes thru tips and exercises here. If you have a leak or two you can’t and you’ll be bashing your head! Good news is that a minor pad leak or two is very quick and inexpensive for a repair person to fix.