Some of these are things I've known for a while, others I've discovered in 2022. I already recommended some of these on NotePD before.

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1. Arthur C. Brooks
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His podcast and column for The Atlantic, and his book (From Strength to Strength).
My quick summary of his work: It's possible to become happier if you work at it (in fact, you need to work at it); the idea that trying to become happier doesn't work is only true when you do it wrong (making it all about yourself, thinking success and money are the solution, being too obsessed about your own happiness, etc.).