Bruce, How are other aspects of your life with your wife? I’m going to guess that you two don’t do a lot together. Is that right? Do you take your meals together? Do you go places together regularly, like romantic dinners? Do you engage in outdoor recreation, weekends, vacations, hobbies, social clubs or other outings together? If the answer is no, you need to start doing these things. I think it especially helps to go out and do fun things with other couples.
You’ve had a long dry spell. You can’t just jump into sex without foreplay. Women need foreplay. Establish a “dating” routine like you did when you were courting. You will have to start “dating” her to get her to warm up to you again. That means doing things together. Not grocery shopping, but fun things. Don’t pressure her for sex. You can drop hints about missing a sex life, but pressure will turn her off even more.
I don’t know what else will have any chance of working. You have to get her to consider changing her attitude. Start with courtship and drop hints. Then begin to have frank discussions without finger-pointing or blaming. It sounds like your lives have been filled with nothing but endless work and worry, and that will kill a relationship and put it on autopilot. You have to put FUN into your lives. When people stop having fun, they actually forget how to have fun. Seriously. A good sex life depends on having a fun, laughter-filled relationship, at least for women. Men can do the deed with anything, but women are not like that.
I hope this helps. Good luck.