If you want the All feed that way, best way I can think of is if you use a client with filters (I use Thunder), try adding the community names to the filter.
I've also requested a "toggle" for filters on Thunder, and may do it myself at some point. But honestly, I switched to my Subscription feed and have been much happier.
Every time a new community has a post that makes Top Day in the first 100, it adds the community to a text file. So I look at that every now and then. I used to have it subscribe my instance, but don't anymore.
I wish lemmy used some sort of organizational hierarchy for subs the way Usenet did. That way you could easily ignore whole swaths off topics you aren’t interested in, like sports, or music, or memes.