How to get the spark back?

I 29M am wondering if my relationship with my GF 27F of 3 years has seen its better days.
For context when we first started dating we never could get enough of each other, and I still feel that way I love this girl with all my heart and I want to be with her 24/7 even if it’s just being in her space doing separate activities. As far as the bedroom without getting into too much detail like I said we never could get enough of each other, but she told me she was going to go back on birth control and warned me that when she’s on it, it completely kills her sex drive. I was okay with this as I was the one who would mostly instigate anyway and could normally get her feeling it. Over time it became harder to get her to say yes, but then she got off it about 5 months ago, and she told me that it should come back pretty quickly to which I was very excited for!! But now we’re only having fun maybe once a month, this isn’t a deal breaker for me as I said before I love this girl so much! I just want to know if any women have had similar experiences and what helped you if anything?
Just for anyone thinking it I don’t think there’s another guy.
We both work high stress jobs and come home exhausted most days. I would rather not give more details on our intimate lives to the entire sub but I would talk about them more privately.

TIA!!!