HELP!! 4 years of marriage and now what?

Sh

My husband and I have been married for almost 4 years, and together almost 10. We were high school sweethearts. Survived dating long distance for 4 years while we both attended different colleges. We are now 26 and life is exactly how we want it to be... besides I feel like we are no longer affectionate. Sex has dwindled. He does work night shift, but it’s basically turned into routine good morning/goodnight hugs and kisses. We go out for dinner, but not really a date. We don’t sit on the couch together. It makes me sad. I try to go out of my way to make sure I am doing things that are romantic or sweet, but he doesn’t really try to do those things back. What should I do? I don’t want our marriage to end at all.. he is the love of my life... but I also don’t want it to be dry and sexless when we are both so young!! Any ideas to spark the flame back??!?