Couples who are still together after

Couples who are still together after 5 plus or 10 plus years, this question is for you...

How do you keep your relationship alive or how do you keep going in the relationship? What’s your secret?

I feel like my relationship is a bit rocky and we are almost four years. I feel like we don’t do the things we used to or don’t get excited about each other anymore. He doesn’t look at me like he used to. We do have a 11 months baby.