Truth is, group rp's are very difficult to keep going. The larger the group, the more difficult. Some people wind up having to leave, some choose to because they lose interest in the subject. Some of it is timing too, no doubt. But really, it isn't your fault in the slightest, mate.
I know from experience group roleplays are hard, but if you keep your head up and just continue writing your best with who and what you have, you'll still have fun. So don't be disheartened. It happens. Let's keep this thing going and have a blast writing together.
Sound good?