You are using too many static pages. Pages are hierarchical and wordpress doesn’t handle page that well. The same goes for Custom Post Type with hierarchical option set.
The only solution here is to ask your host to increase your RAM size. That will solve the problem for now.
But if you continue to add too many pages again, you are again to hit the memory limit someday again. You have to use post rather than page whenever you can. If you really need page for all your content than I must say that wordpress is not the right thing for your need.
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