I have found a high correlation in my life between book reading and general happiness.

When I am in a period when I am reading books regularly, I am generally happy. Things are going well, I have good life balance.

When I go a stretch without reading books, I am generally stressed out and in burnout mode at work, and home life is not great.

Note - this is generally fiction. I read very little non fiction.

Note 2 - most people I know have no books in evidence in their homes. Maybe they read Kindle or other ebooks? But I think many simply do not read recreationally.