I wish my wife wanted to have sex with me more

I really wish my wife wanted to have sex with me more often. I understand that things go on and she deals with a lot but sometimes I really just need to release. I try to flirt more and do more romantic things but nothing works. I’m starting to think she’s just not attracted to me sexually anymore. It makes me sad and I often feel like shit when I think about it. I just really don’t know what to do about it anymore.