In your conclusion you need to go over the main points of your essay and bring them all together in a final summary, which 'ties up' all thje main points you made.
You need to remember your rhetorical devices, so for example you could begin the paragraph with the phrase 'Ultimately,....' in order to give it that summing up feel.
So ity could look something like this:
"Ultimately, Hitchcock creates tension through a variety of techniches such as....."
