You have 13 ongoing projects of which 6 as a moderator and you want to take more? And I see that at least 5 of the 13 projects are on air. Some of them have just started and some are really long. And there are another two in your near future you didn't mention as they haven't started yet.
When I'm looking for collaborators, I go to their profile pages to make sure they are not burdened by many so that they can devote the proper care to mine. It's not only a matter of time. You have to memorize the storyline of each drama, the names of characters and how they are written, the frequent words, remember the flashbacks to make sure they are the same in all instances. If you are a moderator you have to go back and streamline the OST (because the English versions are sometimes wildly different) and of course be present, whether on Google spreadsheets or in private messages, keep an eye on the subbers and answer their questions.
Maybe you are a genius and you are able to do all these things for 13 dramas at a time. If this is the case, I take off my hat to you. (I know I cannot).
We all have some old projects which we advance slowly-slowly. But more than two on-air are hard to handle - that is, if one wants to do the job properly.
This is of course only my opinion. You are free to disagree.