Books for those of no fixed religion but want 'life guidance'

I tried and failed to find the thread asking people's favourite philosopher, hence this new post. I'm near the end of my journey [on earth] and seeking decent books on spirituality not allied to a particular faith. I wanted to share books I've found useful for day-to-day living, with all its difficulties and stressors.

I've joined a lot of different 'styles' over the years - Christianity, Quakerism, Vedanta, Black Baptist.. They each have merits, not least social opportunities, inclusion and support. But I lost belief in a God, and sliding toward being humanist and a Stoic. I want to live a moral life but not chained to a formal faith.

For the last 7 years I've followed the books by modern philosopher, Ryan Holiday, who follows Stoicism - The Daily Stoic. I've found daily Journal writing really helpful, particularly when recovering trauma or my tendency to ruminate on past hurts and abuses.

I am also fond of modern philosopher Alain de Botton. The one I'm reading now is, 'Religion for Atheists' - by turn amusing, amazing and thought-provoking. He puts forward an interesting idea that ditching formal religion as a whole is like throwing out the baby with the bathwater; that  precepts of major religions have a lot to teach about how to live. So, why not use these to form a religion for atheists [those who do not formally believe in a God but want 'morals' to live by]. With the loss of church power and nothing to take its place, Botton makes interesting reading.