Hindu philosophy to find solace in grief

I want to prefix this by saying that I was raised Hindu, but am nastik now. I do not follow any Hindu rituals any longer. Scriptures were a significant part of my upbringing. I had memorised important chapters from the Bhagwad Gita. My home used to resonate with the sounds of shlokas every Sunday. Everybody in my family is deeply religious even today, except me. An important elder in my life recently passed away. I have tried and failed to find solace in things like work and exercise. But these are only temporary distractions. I found comfort in some recordings of old Hindu hymns by Ninu Mazumdar, who was a famous singer. But I believe this is driven by nostalgia of my childhood more than words of comfort in the lyrics. Are there any scriptures that a non believer can also imbibe to learn to accept fate and find true inner peace and solace?