Even beyond subscribing to other communities that are also on a Lemmy instance, you can throw a wider net and use some form of fediverse software to interact with different kinds of instances.

I think Lemmy software may be a little more limited in this, as I haven't had much luck subscribing to Mastodon users on my Lemmy accounts, but I can subscribe to Lemmy communities on Mastodon and Calckey. I haven't really done much with it on Mastodon, but on Calckey I can see Lemmy posts from communities I'm subscribed to in my feed, and I can make a top-level reply to the post but I can't read or reply to the comments (unless they're replies to mine) without going to some version of Lemmy to view the rest of the post.

Still, that makes it pretty convenient to scroll through my own Calckey as well as Lemmy, Mastodon, Kbin, Pixelfed, and seemingly basically whatever else I could want. Sure, sometimes I have to switch sites to engage with the content, but that's as simple as clicking a link or at worst navigating to the post again on the site. With the pace of most instances, that's not hard to do

It's also not oversaturated, so people will actually see and interact with what you're posting, and yet if you cast a wide enough net you can get continuous content to read if you really want to.

I guess the point is, the more you take it into your own hands the more it can do for you.