I recommend buying some Omni anthologies. They’re cheap and you can find some true gems in there.Omg! I’d forgotten about Omni, I used to occasionally buy it as a teenager - took days and days to read it. It was such a great magazine.
Also… Asimov’s Science Fiction, Analog Science and Fact, and Fantasy & Science Fiction, are still published and are all quite good. The online Clarkesworld is pretty great too.