This is a different anon here. I think what the other anon was saying was that you need to have a balance. That doesn't mean being super active because, as you said, your school takes up a lot of your time. It isn't about stretching yourself out so much that you can't handle it, but rather just finding that consistency and balance so you can be present throughout the month in your own comfort levels.
I think maybe focusing on tagging around rather than posting might do you well? With posts, you can't control how many people tag you, so it could be easier to be overwhelmed. Whereas when you're in charge of tagging other people, *you* get to decide how many threads you'll have and how many you can maintain. It could take pressure off you and also let you get more comfortable with Tomoyo, since you'd be able to control the initial situation/reaction and be able to have her interact with characters you know she could bounce off of nicely. If that makes sense.