I’ve been in this game for nearly 40 years.
Ultimately you need only one thing, an unshakable desire to become a professional pilot. This may seem overly simplistic, but in my experience it will be the main factor in whether you succeed or not. I’ve seen a whole generation of pilots and wannabe pilots, and persistence in the face of every adversary set before them, has been the difference between those who make it, and those who don’t!
I guess it’s possible for some to make it without 100% commitment (Silver spoon, friends in the right places etc...) but for the majority.... persistence.
As for the right turns to take along the way? First get your arse into an aeroplane, and grab every opportunity as it comes.