How to keep attracting my partner in a long relationship?

Novelty always brings arousal. But how to deal with a long term relationship? Nothing crazy, but I just want to keep attracting my girlfriend more and more with time. Any advice? We have regular sex, but I feel like it’s becoming more of a routine. I want to spark desire and curiosity, I want to explore her most intimate dreams. I’m a very stable and reliable partner, but I also want to be viewed as a desired lover. Thank you!