A Chinese communist news site full of happy news is called Sixth Tone.
Another is China's official newspaper, People's Daily.
I love what I've read on there, but I tend to barely read articles. And please, if you spot an podcast in English on one of these sites, let me know!
True Anon is very fun. I wouldn't necessarily describe it as "happy", the topics they cover are generally kinda grim, but the hosts are fun, funny, and upbeat
Brace and Liz are a manzai duo #truefax
Last episode, especially the intro, was so funny. Communist podcasts (not Chapo) have been great lately.