Not to be to philosophical, but I feel we misunderstand what is “true” happiness.

For instance, I love stationery and discovering (and owning)new stationery. I feel happy with I look at my stationery collections and I use it as sort of therapy when I am not having a good day. Just going through them and reorganizing them helps me calm the waves in my mind.
I also love watching K-Dramas with their mostly happy fairytale like ending and of course actual fairytales too. They make me happy too, and some of the comic scenes in them are truly iconic. When I want to disconnect from reality I always turn to my Watch list on Netflix for that much needed break.
Spending time with my family makes me happy too. Just seeing them happy makes all the troubles of life worth it. On the other hand, being an introvert, spending time alone makes me happy too. I love delving into my world of imagination, I am essentially doing noting, but I am still happy.
If you ask me which of these is true happiness I would claim all of it are. It just depends on the time and the reason why you are down to truly understand what you need to be happy again.