Hello fellow redditors

Throw away account.

Me ( M27 ) and my gf ( F25 ), have been together for 6 years, and living together for the past 3. We love each other very very much, and we both now that both of us want to stay together for the rest of our lives. We complete each other very well, and we have a very fulfilling life together. But when it comes to sex, I feel like there is a huge libido difference between us. I would say that I have a regular sexual libido for a 27yo male, but I feel that it is very far from my girlfriend's. In the beginning of the relationship, I thought it might be normal, with the confidence and intimacy build up with time, she would get more into it. But she didn't. Over the time, I tried to stimulate her in several different ways in order to understand what gets her going (different ways of arousing her, different kinds of lube, sexual toys, and so on ), but with not that much success. We do have sex, but very far from the amount that I would want by now. She says she simply doesnt have the same libido as I do. I even bought a small piggybank so I would put 1€ there everytime we had sex so we could do anything nice together by the end of the year. In more than 4 months, we accumulated 16€. She guarantees she enjoys my body, and our sex life. And I feel like she means it.
But by now, I have been turned down so many times, that a few months ago I became demotivated to try to initiate sexual intercourse at all. Any suggestions/advices?