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
Last episode, especially the intro, was so funny. Communist podcasts (not Chapo) have been great lately.
Brace and Liz are a manzai duo #truefax