I'm someone who draw comics on a regular basis (usually 9 pages a week), and even I myself have days where I'm just completely unmotivated to draw. So let me point out a few things:
1) 64 pages in a month is a lot. I understand that when you finally have time to pursue your passion, you naturally want to use the most of it. However, if not done in moderation, you'll end up ignoring both your mental and physical health, and the quality of your work will suffer greatly too. In the end, you won't be satisfied with the results, so try to take it easily.
2) I spend most of my free time daydreaming, so I have a boatload of story ideas that I want to work on too. However, if you nitpick them, you may realise that you just aren't ready to develop some of them. So here're a few tips on choosing which story to develop first:
-Categorise them into specific genres/themes, then pick the category that you're most capable of developing. E.g. You may want to draw a story with a broad cast of characters and complex world building, but you have difficulty keeping up with all the different lore. Try something of smaller scale, a story consisting much less characters and simpler lore.
-Choose the story that has the gist of it done. Basically, choose one that you know where the flow of the story is going, the cast of characters, the main conflict, and at times the climax and ending. The more you know about a story, the easier it is to develop.
-Don't jump right into the comic, start with storyboards. Or thumbnails, as others call it. It's basically a mini and simpler version of your comic, about positions of the panels and how the scene will go. Try mapping it out first, then consider if it's within your capabilities or not.
3) And lastly, enjoy the process. Don't make drawing comics an obligation, because it sucks when you're forced to do something. Take it easy, do it on your pace. Take it as a refresher from your daily stress, not another burden to carry.
Hopefully this long post can help you. Best wishes 
