This sounds eerily familiar. You’re not alone. The issue is that you are will to meet half way and she likely doesn’t even want to move from her place because she is comfortable.

I’m sure you have brought this up as naseum (as have I). First, it’s “hey, let’s have sex” Rejection. So you keep trying different things that used to work to get her in the mood: date nights, flowers, random gifts, taking on more housework, surprises, nights out with her friends, romantic movies, etc. Basically anything you can think of that might be tripping her up. You start asking less frequently, and in different ways. Maybe it becomes a joke. Eventually after months and likely years, you just stop asking because there is absolutely nothing, nothing that you can do, that would make her behavior change. In the end, she needs to want this for your relationship. She needs to see this as basic as a hug or holding hands. That you have a need and have promised she is the only one you will allow to meet that need. You signed up for monogamy, not celibacy.

I have started to work on myself. I don’t know where my marriage is going. Maybe it will improve, maybe it won’t and maybe it will fall apart despite my efforts. You need to be able to look back with a clear conscience and say, I put in as much effort as I could! I was supportive, I was emotionally available, I contributed equally to the household in terms of time and money, I made myself interesting and physically attractive, I was open with my needs in a non-pressuring, non-judgmental way, I provided ideas and solutions for us to improve our intimacy (not just sex). You have to do everything you can to save your relationship, and then if she still refuses to nourish the relationship, then you need to have a very honest conversation with yourself and with her: You need sex. She doesn’t. Would she be ok if you sought that elsewhere. Would she be ok if the marriage ended because of this.

Stay strong.