I’d love to hear from someone on this forum who’s had success with a spouse who is denying them sex. I’m sure you know that your wife’s cheating you of sex is sinful, but I don’t know how you would get her to see this. Have you told her that this is unacceptable? Have you asked her to make a doctor’s appointment to rule out medical causes? Do you believe that sexual infidelity or porn (yes, folks, those sins aren’t just for men) could be contributing to her refusal?
Again, I don’t know how relations are between you, but you have to get through to her that you two are resuming your sex life, and you will help her take whatever steps she needs to do to make that possible. (And to avoid misunderstandings, I am not suggesting that he grab her and force her. But she needs to identify the problem(s) with him touching her, and she needs to make a plan with him to address those problems.)
You should not have to beg for sex. This is something that concubines were owed by their masters, for Heaven’s sake. (Exodus 21:10) It isn’t something nice that you earn by being a good husband, nor an optional extra. If you and she are both physically capable of relations, you are not to deprive each other.