I do want to keep trying but I've run out of what to do.
Then don't! No matter what your friends and therapist, or anybody else, including your wife, are telling you. We're told here that if only one person in the relationship changes...then the relationship WILL change. That's the dynamics of it. It can't help but change.
Then keep on trying. Sometimes I suppose there is nothing else we can do, except work on ourselves. Period. And have patience, patience, and more patience.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.