If you're writing and drawing all your comics by yourself, you might want to work on the other projects and not start posting them until you're much further along. This way fans see you updating regularly on the stories you already have posted and get to know that you're dependable. This also lets you create enough content that you can have a nice buffer on the newer projects once you start posting them.
I always wrote and didn't do the art side of the comics, so I was usually ahead of my artists and I could be working with 2-3 at a time and bouncing between projects as well as searching for new artists for my latest story idea. I found the freedom to bounce between projects kept me writing without getting board of any particular story or set of characters. I felt bad because I did notice that when the artists needed a break, or wanted to work on something new readers would get nervous. So if you're doing it by yourself, and are fairly new, it could be a bit of a problem. So, maybe get more experience, figure out what kind of rotating schedule you can stick with, and only start posting new continent when you're confident.