Sorry for the late reply. I've had a busy week.
I'm always happy to get feature requests, so feel free to send any ideas you might have. Arctic has reached a relatively stable and mature point, and sometimes I struggle finding new features and improvements to add.
I really like this idea. I'd never considered using the account block list for filtering Lemmy Explorer. Integrating this should be straightforward. I'll also add a toggle to enable or disable filtering. I'm trying to find a way to integrate Lemmy Explorer in the Lemmy search view. I just haven't figured out exactly how I want to do this yet. That will likely be part of a larger update.
As for excluding NSFW, I think I will make it so that the last selection is saved across sessions, rather than resetting every time.