Leadership begins with strong and active communication, not just by lecturing them or giving them instructions for their stubborn behavior.

Leadership is not a quality kids are born with but it's something they learn and grow in them by the time, and when they guided in the right direction and with right thought process. children are like a plain paper, it get filled as you command, they learn life rules by watching you not by listening you, for example if you want them to read books and use less mobile or gadgets, first you should be doing that instead of lecturing, they loves to walk on your footprints. 
Here are some powerful parenting techniques that quietly nature the future leaders:

1- Encourage Decision Making: 
Let your child decide what they wanna wear for the day what healthy supplement they want to eat today, planning a activity for weekends these are simple small daily decisions you have to let them take. It builds confidence in them and shoe them that their choices also matters.
2- Encourage Problem solving: 
Instead of resolving their every problem, let them solve that problem on their own, don't mess and hurry just let them take their time and come to some solution. Ask some questions, like you also don't know,  " what do you think we can do on this matter?" this teaches them taking initiative for their problems and build critical thinking and independent leadership quality.
3- Praise them for their efforts, not just outcomes:
Praise their efforts even if it didn't give any positive result, celebrate their hard work this builds grit and a mindset where they want to do more and grow, these are the key traits of resilient and adaptive leaders.
4- Create a safe space for failure:
Don't punish them for failing any task, if they tried for that make them feel it's also part of life, you don't have to be afraid of failing, that makes them confident and they try to take more initiatives. 
5- Give responsibilities early: 
Give them responsibilities earlier, because responsibilities build accountability and self leadership from a young age, always remember a responsible child will never grow as a stubborn one. assign some small tasks according to their age like, managing a calendar, organizing books or making bed, setting dinning and stuff like this.

Conclusion:
Kids learn by watching, speak clearly, and listen them actively, let you child express their opinion.