How to get my husband interested again

Okay girls. I need some advice. My husband and I used to have great sex and often when dating and engaged. He was my first, but he had a previous partner before me. When we got married I was more open to having sex more and more comfortable with it due to my religious upbringing. Weird part is that he seemed to lose interest. Suddenly he starts saying we don’t need to all the time and it not as important as other things. Like he accepted the stereotype that when you’re married you don’t have sex. It’s been something we’ve been working on the past year. He just seems uninterested now. Barely intimidates, will turn me down, doesn’t really react when I dress up for him. We used to have sex in the shower, car, etc. now it’s hardly at all and in bed usually late when he can’t sleep. He started up a business and had extra stress on him so I’m not sure if that’s affected his sex drive. But I’d like to have more sex and try new things with him instead of the same thing every time we actually do have sex. Suggestions??