There is no way to really build a special soccer player.
Because you can basically be average height and dominate, your competition will be about 8 billion people.
Either you're going to "chosen" to be special where the game is just so incredibly easy for you to the point that it's disrespectful for the other 8 billion people to be on the field with you, or not.
Messi was an average-looking Spanish/Italian was doing this:
That's just not physical attributes, that's just chunking the game in an incredible way, seeing, processing and playing with the situation in ways other players are not even thinking about. It's not that he grew up in a soccer family or had brothers who played soccer either, a lot of people grew up the same way in areas that loved soccer even more, with better coaches - and they're no Messi.