The last thing in your essay can be a reconnection to your hook. The hook had the job of getting the reader's attention by being broadly interesting, so connecting back to that idea gives a way for your reader to carry the ideas from your essay back to their every day life.
If your hook is a question, you can answer it. If your hook is a controversial statement, you can revisit it in a way that gives a different context to what we might think is controversial. If your hook is a truism, you can offer a different take, or a different view on that idea.
In the end, your essay can use the hook as a way to get your reader to want to read your essay, and at the end you can revisit that hook as a way of showing your reader what your essay has taught them.
In an essay about the concept of heroism, as seen in The Odyssey and To Kill a Mockingbird, the author opens the essay with this hook:
It is easier to pinpoint an evil person than it is to find a hero.
They close their essay by reconnecting to their hook in this way:
Although evil will always exist, heroes will do their best to protect society and prevent malicious acts from occurring.