Yep. I don’t have a specific way to generate suggestions of what new users may want to see or filter. Typically noisy (by volume/content) or controversial are the topics I’d imagine make sense. However, even just a toggle to filter NSFW by default is a start - that could include 20 or so common explicit hashtags or words. The art will be a balance.
One way could just be a past 24 hour summary of popular/common words or hashtags based on the relays you connect to.
Another could be a guided tour on how easy it is to add a filter - like long-tap a hashtag, or highlight a word/phrase.
Maybe some kind of “see less off Y”. Maybe with randomness. Maybe this is where custom shareable filters and dynamic client evaluated views fit.
I do think Nostr has lost a lot of people just after onboarding due to global being Wild West and it being less easy to discover or port over who your current follow lists from elsewhere.