Well, certainly you should not feel personally responsible for the activity level. Just participate in whatever way or frequency you like. And if you don't feel comfortable sharing your work, that's not a requirement either. I remember when I first started learning Inkscape, and I didn't want to show my work either. It was a long time before I posted a drawing I made. So I know what that's like and I understand. (Perhaps surprisingly, I'm familiar with your health issues. And plus, I have chronic health issues myself. So I understand that part too.)
I have seen forums that force members to post a certain number of times per year or month or week, or else their membership will be cancelled. But I think that's outrageous. Those forums were not fun to participate in and were not particularly informative or helpful, because of the crappy messages that were being posted, just so the members can meet their quota.
Anyway, I hope this forum does become busier, eventually. Realistically, it might not. But as long as I'm still enjoying admin-ing, I'll keep it open.
Even with little activity, it serves to promote Inkscape! So just have fun at your own pace
