Books about people who start a new life (but don't find happiness by falling in love)

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I'm looking for recommendations for books (fiction or non-fiction) about people (ideally women, preferably middle-aged) who start over (new job, new area, whatever), ditching an unhappy life and finding happiness. However, that happiness is not found by falling in love and living happily ever after.

I appreciate that's really precise! I'm just sick of 'and then she found love and therefore was happy' books.

Folly by Laurie King. A woman with a troubled history of mental illness moves to a remote island alone and builds herself a house. The details of the house building are enthralling. There is a kind of romance toward the end, but it’s not the pivot of the book. It’s a favourite of mine.

Tracy Chevalier, A Single Thread