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Hi there -- this gets asked here fairly often. You may gain some insight from this post from u/RioAbajo, and might also consider cross-posting this to r/AskAnthropology. (The site is old enough to predate written history.) https://www.reddit.com/r/AskHistorians/comments/3fnuis/does_göbekli_tepe_definitively_change_our/
Here are a couple of other threads on it, as well:
https://www.reddit.com/r/AskHistorians/comments/4yk5vt/any_explanation_for_göbekli_tepe/
and
https://www.reddit.com/r/AskHistorians/comments/5ry6g4/what_are_your_thoughts_on_gobekli_tepe/