Recorded myself saying 'u Dubrovniku' and it sounds nothing like the locals; how do I fix the pitch accent?

I record my daily read-alouds to track progress in Croatian, but I’m really struggling with the falling and rising tones. Whenever I say 'Dubrovnik' or try to navigate the locative case endings, I sound like I’m asking a question instead of making a statement. Does anyone have a guide for mastering the stress placement so I don’t sound like a total foreigner?