I’m going to take this as a request for reflections on life - apologise if that is not what you are looking for. anyway, my top 3 in no particular order:

The Subtle Art of not Giving a F*ck by Mark Manson - look past the title, there is real wisdom here

Being Mortal by Atul Gawande - because we’re all getting older and thinking about that honestly puts things in perspective

The Four Agreements By Don Miguel Ruiz - a little mystical in presentation for some but underneath that there are some deep thoughts

An honourable mention goes to The 7 habits of highly effective people by Stephen Covey which I listened to on cassette 30 years ago and is still useful.

Generally, exercise and contact are also really important, learning meditation/ mindfulness has also helped me hugely in tough times.