Welcome to Shopify Community. My name is Olivia and I work here.
I'd be glad to lend you a hand and help you figure this out today. I found a few different third party apps that you can integrate on your site to offer DHL shipping and more. Check out some of the ones I found for you here:
I encourage you to check these out and compare your options to see which is the best fit for your needs. If you have any app specific questions, please know you can connect with the app devs for further support.
Let me know what you think and if there's anything else I can help you answer.