Uh-oh. Sounds like we need to get on the job and solve the case of the missing app store icon. With that said, I've got you covered.
Right off the bat, there are a couple of different ways we can do this. First, let's start things off simple. Go to settings > general > restrictions. If restrictions are enabled, toggle "Installing Apps" back on. Did the app store reappear? If not, no worries. Next, go to settings > general > reset > reset home screen layout. How did thing work out this time? Hopefully well. If neither of these steps worked, please let me know when the icon first disappeared and if it coincided with any changes. I look forward to it!
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