Idk. There have been some sites recommending the alternative to a subreddit. I scrolled through that. And put keywords for my interests into the search bar. Occasionally I spend some minutes scrolling through the 'All' feed and subscribing. Or when somebody links a crosspost. Over time I've also unsubscribed from lemmy.ml communities because I don't agree with their moderation practices. Found alternatives to that. And I've unsubscribed from most of the news communities, because reading about world politics is weighing me down and this place (Lemmy) is a lot about discussing the news.
I'm subscribed to roughly 100 communities now. Some of them are duplicates or a wasteland, that's just how it is. But I like that this way, my feed is somehow tailored to my interests. And there is no doom-scrolling any more, which I like too.