Having a set of trending/popular hashtags (like #introductions, #artonnostr) below search on global only for brand new users (ie.those having no follows/ no notes) may help. Particularly because on Amethyst, since the Home Feed will be blank, their first view of notes will be on global & the hashtags may make the truly wild beast of global a bit more tame.

For others, don't know if filtering global is needed (I don't mind most of the bots & blocking frequent posters like DM-bot works). If someone has figured out relay settings/paid relays, they've made a conscious choice about their feed and given that there are 500+ relays now, it's not possible to not miss out on some stuff.