I can do the 3x a week promise. I do believe in myself, but I'm afraid that she'll view it as "pushing" her. I'll probably get hit with the "too little, too late" thing again. I don't mind being held "accountable" for it.
Just put it on the table without a deadline and it won't seem pushy. You could even express it in a way that made it clear that it is something you want for yourself and intend to make a goal in the future with or without her participation. Of course, only do this if you really do want to be a more sexual person in the future. When my 2bx called me and tried to proposition me recently he also said "I'll probably never have sex again." in the same conversation. That didn't exactly inspire my confidence in his renewed sexual drive.
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver