As spoken prior, a crazy ton of writing gets you really winded out; thus eliminating that spark. Trust me I've been there. Took a 3 month break and I started back up.
As the others said, take your time. Great writing doesn't have to be fast. I've been working on my one story for technically some over 2 years now. Maybe 3, I'm not counting.
My point is, enjoy the process. If it turns into a chore, do something to make it not.