He gets captured by pirates, and he incessantly demands they treat him with respect and that he is going to come back and crucify them. They don't kill him, and he later comes back and crucifies them.
During his Gaul campaigns, he would regularly be in the thick of the fight, and several times came close to being killed.
During mutinies, he would regularly go out among the mutinous soldiers without really a whole lot of protection and talk them down. He could have been easily killed during that time.
So what we see as complacency or fatalism, may just be Julius Caesar acting like he always did. That strategy had worked his whole life, until at the end, it didn't.
Not that I'm saying you're wrong, but invading Parthia would be a rather different story than invading Gaul.
Well, sure, but when the question is "who's good at winning?", it's not obviously wrong to see what the victors think.
Hannibal was one of the greatest generals according to a history written by the victors, even though the victors despised him.
Montgomery vs Rommel is a good example of that too!
In fact, given the political needs in ensuing decades, there's really no need for the "story" to reflect the record at all.
Note, I'm not necessarily saying Caesar was bad. He did win, as you say. But he had significant materiel and troop advantages against the Gauls and against Pompey. Maybe we should credit him more as a politician and less as a general.
Julius Caesar was one of the greatest generals in history, and arguably Rome's best general (with the possible exception of Scipio Africanus). In addition, as evidenced by his visit to the tomb of Alexander the Great, he idolized Alexander, and I am sure would have loved to try to do what Alexander did in conquering Persia. Years later Trajan did figure out how to invade the Parthian capital city of Ctesiphon by moving columns down the Euphrates - so a successful invasion was possible.
With Julius Caesar's assassination Rome fell into civil war. Mark Antony tried an invasion, but as history showed, he was not nearly the general Julius Caesar was. Julius's successor, Augustus, was not a military genius in any sense, and was too worried about his position in Rome to risk an invasion of Parthia, and was content just to get the Roman standards back that had been lost by Crassus.
Subsequent history may have been a lot different if Julius Caesar had not been assassinated when he was.