Find someone you like and see who they follow

Check the follows of who I'm following

Check the reply threads

Check the suggested follows on other clients

Check Global (on clients that support it - like Amethyst)

Youncan make, share, and browse contact or content lists on https://listr.lol/

The spring nostr browser app on android makes discovery/adoption of nostr apps easy: https://spring.site/

Check out follow lists of people you respect and like. Alternatively check out some hashtags you might be interested in! There’s tons of stuff on here.