Man I used to love bjj. The same fire isn't there and tbh, hasn't been there for some time. I'm hoping to pull out of this soon. My main motivation to train stems from my investment in the development of a younger student, as a way to keep ties with good friends, and the realization of a dream to become BB.
I am starting to realize that my impact on this student is not as great as I think it is. My friendship with my bjj friends is getting harder to maintain as our lives go in different directions. I'm pretty sure I"ll get my BB in 2020 so the door might be closing. This is all to say when you're in love, it's hard to imagine a day when training may progress from something you love, something you do out of habit (like brushing your teeth), to something that may even start to wear on you. This hit me really hard when even directly after training I regretted coming to class bc I just didn't have any fun - something that had never happened to me before.
Ultimately I think you have to keep in mind why you got into it. I have a distinct memory of the time I decided I wanted to get my BB, so I want it to happen. I also got into BJJ for self defense and my time would be better spent wrestling or getting back into striking arts. It would be a shame to hang up the belt but I had a good time and am excited about my future, with or without bjj.
TLDR - If BJJ isn't fun anymore, take a break. If time away doesn't make you miss it, maybe take up another hobby. If another hobby is more fulfilling, just do that.