Potential is what everyone has inside them, it is the education, learning, development, support and time put in that enables one to continually develop their capabilities. This can increase, at least until either physical or mental limitations constrain further growth. 
Interference is what detracts from potential to reduce performance. This can be down to any number of reasons, perhaps environmental or external factors, physical or mental hurdles or limitations, poor execution of process, inadequate self-management. Many of these can be deatlt with in some way; however, the greatest threat in most cases is from attitude and mindset. Perhaps it could be something as simple as seeing yourself failing and recalling the look of an angry parent, a doubting physical education teacher or a school bully from your younger years who always told you that you did not have what it takes. – This creates that painful memory which instils that moment of hesitation or self-doubt just when you least need it. – Who hasn’t at some time during their trading had that pang of self-doubt, or lacked the self-belief or confidence just at a crucial moment, and then looked back with regret and heartache, in some cases leading to a whole cycle of self-doubt and poor decisions, execution and position sizing.