>>421674given that you probably have zero studies
no money to acquire other skills...
work harder, longer hours
be proactive, attentive
treat every customer like it was the only one
be involved in solving every problem the restaurant faces
eventually you'll get promoted. if not, leave after 6 months, try elsewhere
once promoted, step up your game
work more, harder
get involved in budget, supplies, work schedules, work disputes
be promoted to manager, then general manager. if it doesn't happen in 2 years, leave
once you're manager, make sure the restaurant stays in business, then increase profitability
by then you'll have choices and experience
best next step is to aim for a stake in the restaurant, become part owner
then part owner of a second, a third...
none of this recquires other than working hard, being proactive, learning from everything and everyone just at work, and keeping your dick in your pants most of the time
godspeed