I use sync for lemmy personally. With that app, you can filter out posts by instance. So if you put lemmy.ml, I believe that would block all posts from lemmy.ml communities
You could also use the subscribed view to only show communities you're subscribed to. The next version of Lemmy will have a filter to block communities on an instance basis.
Is there any timeline on said version? The two options being minimal content (subscribed) or unpleasant firehose was an astoundingly poor choice as a starting point. Serendipity without the bullshit is juuuuuuuust right.
Soon, probably. Been in beta for a while. But I subscribed to a lot of communities back when I was using Lemmy federated, didn’t really have minimal content.