Finding good people to follow has been a challenge for me both on mastodon and nostr. But I find just posting and seeing who likes my posts and then following them has got me a decent feed curated at this point. And searching hashtags for topics I’m interested in.
There are some bridges so you can follow mastodon users on nostr and vice versa, but it’s not quite the same. We’re still pretty early adopters on both platforms at this point.