Not OP, but this was the book that first came to mind reading your post and the talk of Buddhist practices in the thread.
"Radical acceptance : Embracing your life with the heart of a Buddha"[0] may be of interest to you. It won't answer the existential questions for you or get real deep into philosophy or Buddhism; it does have actionable exercises to try and meditation practices/instructions attached to the different concepts covered. At times it will use what I would call woo-woo language, overly fluffy "love & light" phrases--so if that bothers you, simply discard it and take the practical nuggets that are also included. It is more a book to help "come to terms" with (life, basically) and in turn helps (or may help) resolve some of the heaviness in an unexpected/indirect way.
"Radical acceptance : Embracing your life with the heart of a Buddha"[0] may be of interest to you. It won't answer the existential questions for you or get real deep into philosophy or Buddhism; it does have actionable exercises to try and meditation practices/instructions attached to the different concepts covered. At times it will use what I would call woo-woo language, overly fluffy "love & light" phrases--so if that bothers you, simply discard it and take the practical nuggets that are also included. It is more a book to help "come to terms" with (life, basically) and in turn helps (or may help) resolve some of the heaviness in an unexpected/indirect way.
[0] https://search.worldcat.org/title/57351231 (2004 version, version I read)
https://search.worldcat.org/title/1400088877 (2023 version)