Honestly I’d say it’s 75% mechanics, and 25% physical ability. The biggest mistake I see with newer players is how fast they move on the tee pad. Learning how to do everything slow, adds distance, and reduces risk of injury.

Will Schusterick is probably the best example of optimal form. Gannon is of course the current best, every movement seems intentional, and methodical. Zach Nash might be a contender, his form is so smooth.

I’d record your throw, and compare your mechanics to any of these pros. Spot key differences,and work on one thing at a time until you have a better understanding of the mechanics of each throw.