
For a young physicist struggling to find his place in the world, the relationship that would most profoundly influence his life was with his mentor, the Nobel Prize-winning physicist Richard Feynman.
Leonard Mlodinow has written two books that you might find both resonant and uplifting:
Feynman's Rainbow: A Search for Beauty in Physics and in Life , and The Drunkard's Walk: How Randomness Rules Our Lives.
Furthermore -- if you went to grad school and learned something, either about the subject or yourself, then the effort was not a failure. In the long game, it isn't about the degree nor the piece of paper.
Minor spoiler alert.
Feynman had a strong dislike for string theory, even going so far as to shout at someone "I don't want to talk about string theory!" Presumably, Feynman could sense that this kind of "search for beauty" was against empiricism. I always found it interesting that even back then, when empirical observation seemed to rein supreme, there were those who eschewed it and searched for meaning beyond what nature presents to us.
If you like to read more about this, take a look at Mlodinow's "Feynman's Rainbow" - it's a small autobiographical book about his time as a starting physics post-doc after a highly promising PhD thesis. He had his office a few doors down from Feynman (Babylonian) and Gell-Mann (Greek) and the book juxtaposes both positions.
Mlodinow took up screenplay writing as a hobby, similar to OP's text his old PhD supervisor got angry when Mlodinow told him about his new hobby, "what a waste of time and thinking power" (paraphrased quote). He actually did end up writing a few episodes for Star Trek: TNG and is still a accomplished scientist, with quite a few successful popular science books published (one with Hawking: "The Grand Design").
Another thing:
>Salvador Dali would dream in his chair as part of his work routine. The authors of the paper “Dual thinking for scientists” suggest controlled risk-taking, and artistic hobbies, and so called “mind-wandering” into future scientific education.
You might have heard this (I think unproven) story a few times. Descartes always famously slept until lunch-time. One day he was idling in bed and watching a fly, which gave him the idea to describe the fly's movement in terms of three coordinates. Thus the Cartesian coordinate system was born.
But still, here are some I probably bought for $0.99 and enjoyed:
Lost Restaurants of Seattle
This Outcast Generation by Taijun Takeda
The Royal Navy Lynx: An Operational History
A Doctor's War by Aidan MacCarthy
Sniping in France by Hesketh-Prichard
The Art of Whittling by Faurot
Moscow Calling by Angus Roxburgh
Feynman's Rainbow by Leonard Mlodinow
Icelandic Folk Tales by Stefansson
If you like any of those topics then you have my random recommendation, and possibly the indulgent vanity of once more having avoided consumer risk, or maybe consumer regret.
These were fun in 2022, in addition to 1) web browsing, which I find is definitely reading, despite all its numbered-pagelessness, and 2) dipping back into lots of classics and favorites, from Blacksad to Darwin to Scaramouche and Tom Sawyer.
(Possibly throwing in a volume on the adventures of Groo, a Weird Tales, a Comics Cavalcade, some TTRPGs, and a Scooby-Doo Team-Up...)