Couple options: you can pick up a sight pusher off somewhere like eBay or amazon. I think I got mine for around $40. It’s nice to have one if you decide to build your own glocks in the future.
You can also bring it back to the store you bought it from or bring it to a gunsmith. They can easily align it for you.
Just don’t take a hammer to it. If you insist on doing it on your own, use a rubber mallet and possibly put a micro fiber towel or cloth over the sights first. This last option obviously poses the greatest risk to the finish of your gun.