Unpopular opinion: to be “good”, Portuguese fiction doesn’t always have to be artsy. Sometimes it’s okay to watch some mainstream shows and films.
Watching local fiction is a great way to understand the creative vibe of a country. The same goes for novels, too, if you can easily find Portuguese books translated into English.
Some of my suggestions below are available on streaming services like Netflix and HBO (although, as far as I know, they might only be available in Portugal), the Portuguese public television channel streaming website (RTP Play), and I’m sure all of them might be available online in places like YouTube.