Hmm... is your one drawing a day quota self instated, or is that from commissions/requests/homework for someone/something else? If it's the prior, you might benefit from taking a break from drawing for a little while, and coming back to it when you feel more motivated.
I feel like sometimes stepping away from an activity for a bit is better than trying to force yourself to do it, and getting sick of it as a result. Not drop it entirely, of course, especially if it is something you enjoy, but whatever amount of time you need to get that feeling back.
Now, I do wish to make it clear: I don't draw, I don't know everything about your one drawing a day quota, nor can I say I know for certain the source of how your feeling, so my advice may very well be completely useless. That being said, I do hope that, whatever you do, you are able to find the motivation to continue drawing, and more importantly, enjoy doing so.