I think that maybe MrsNOP has the right idea. Your wife CLEARLY has problems with being sexually responsive so maybe it would be better if she practiced at being sexually assertive first. I mean we all know it would fit her personality type better . Besides it is actually easier in some ways to be assertive rather than responsive (as long as you have a reasonably responsive partner ) because you can do all the prep work to get yourself in the mood and/or aroused yourself.
I do agree with what some of the others have said about the fact that you seem particularly dispirited lately. Maybe you need to do what I did and have a few too many and call MsHD the equivalent of a "fastidious pr*ck" (LOL) (JK please do not do- I would not want to be responsible for the consequences.)
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver