Can I rescue my sex drive?

My boyfriend has a really high sex drive and at first I did too. I started the pill and it died. Ive since switched to the implant but I still can't get it back. Sex just seemed to get boring. We have been together over 4 years now and have had a fairly exciting sex life playing with toys, bondage, filming, anal etc. 
Now he masturbates a lot, every day at least and when we do have sex he can't have quickies anymore and I usually cum before him. I sort of feel likehe doesnt enjoy it anymore but at the same time I cant feel bothered to try really hard either.
We live together but work hours mean we dont actually get much time together. 
Although we have tried a lot in the past does anyone have any suggestions of ways I can try to bring back some excitment and lust?