She doesn’t enjoy sex with me. How to make it better?

I’ve been with my gf (35) for 3 years and we have a little 2 year old. I love her so much and the sex was so good at first but now she never wants to have sex with me and I am starting to feel unattractive. We had a few fights about this. She says she is tired from taking care of our child and working since I’m out of a job. I work on my own projects and live on my savings. I asked her gently if it’s me or if I should change something but she said it’s not me and to not change anything that I’m perfect and she loves me so much and to not worry about it. I still worry a little. She said maybe she just doesn’t like sex anymore and lost interest. I said maybe we should go to therapy or counseling together but she said no.<br><br>I told her I am worried that she finds me unattractive. She said it’s not that. She said she is very attracted to me but just doesn’t want to have sex. I am confused.<br><br>Do you have any tips on how I can make it more enjoyable for her? What is wrong?