At the age of 41 he was awarded the post of praetor - a commander and sent to Spain where he found Caesar discovered a talent for military command which he himself hadn’t known he possessed. According to Rome empire.net, Julius Caesar and the Roman People there was one lesson, Caesar learnt in Spain then it was that war could be politically and financially very profitable, which was important because ever since a young age he believed that the road to power was via wealth. Upon returning to Rome he was given a choice consulship or a triumph, he chose consulship. At this time he was already deeply involved in politics, part of the reason to send him into Spain was to get him further away from politics in Rome. Still this can be seen as his choice to venture even deeper into politics instead of war. He was not a bad statesman by any means, in fact he was beloved by the plebs aka the roman peasantry, however he was blinded by his hubris, he did not see the conspiracy to kill him brewing under his own nose. After all, everyone loved Julius Ceaser.
Much like with Napoleon, his ego was not misplaced, he was by all means the greatest general of his time. Conquering Gual, part of Britannia, defeating Pompey and Vercingetorix. However he was not as great of a statesman as he thought. As stated in Power Ambition Glory: "Only at the end of his life, at the height of his success and power, did hubris, ego, and the daggers of his assassins converge to destroy him."
Once he misunderstood what he was he failed.