Asking wife to vary / change up her blowjob technique
I love my wife and sex with her. In general she really struggles with any kind of non positive feedback, constructive or not. For most of our relationship she has only occasionally given me blowjobs and for almost all of I've them she'll generally just grip my entire penis with her hand and then just suck the tip maybe going back and forth a bit and using her tongue. This feels good but doesn't really get me off. She also used to suction it a bit and "pop it" but that actively hurt and after I told her that it stopped.
I've gently tried to give her feedback during and outside of sex to play with my shaft more, use her tongue more outside, play with my balls, vary it up by going deeper etc, but she just kind of ignores it and had done so for years now.
It's a little frustrating because there's been times on our relationship where she has criticized my technique, pretty non gently, for giving her head and for how I thrust during sex and I took those in stride, researched and then practiced with her and got feedback to make sure she felt great. I feel like sometimes our sex is so focused on her pleasure and getting her to multiple orgasms that she often seems tired and or unmotivated to do the same for me.