Get a life of your own. Your husband needs to start missing you.
If you’re not already, get yourself in shape. Become hot and sexy. Start dressing sexier but don’t be tacky. Sexier doesn’t need to mean trashy or slutty. Be tasteful, but remind your husband of your sex appeal. If you don’t have sex appeal get some. Sex appeal can be developed.
Take an interest in other men. Obviously don’t be inappropriate. You’re trying to get your husband to want you more not divorce you. Men tend to want what other men want. If your husband thinks other men want you he’ll start taking notice. You need to do this in conjunction with getting yourself back in shape and sexing up the way you dress a bit. You want when he starts to take notice he’ll see something that he also wants.
Don’t be rude or disrespectful to your husband but act bored with him. Don’t make him know you’re doing all this for him. It’s just the same as if you weren’t married and were trying to catch someone’s eye. You wouldn’t tell him you’re dressing sexy for him because you’re trying to make him interested. Don’t tell your husband either or make it in any way obvious. Make him wonder what’s going on with you.
Depending on your husband’s mindset you might not manage to get him slapping your ass until you’ve trimmed down to a size he considers sexy. All men are different and some men just don’t find bigger gals appealing no matter what they are wearing. If your husband is turned off by bigness, just throwing on some daisy dukes won’t get him salivating. It’ll likely get you a “what are you wearing?” asked in a disgusted tone. Know your husband well enough to determine when the time is right to start teasing him visually. When the time is right start showing him a little more skin, but still refrain from making yourself obvious.
Repeat: Get a life of your own. While you’re out getting a life apart from your husband and outside of your marriage you might find yourself caring less and less about the fact that your husband doesn’t want you any more. He might go searching instead to find out how to get his wife to be interested again and then your problem will solve itself.