A scarcity mind lives in fear and doubt. Success, opportunity and resources are limited. Ideas and work are constantly compared to others because the only way to achieve is to get to the top of the stack.
Creativity, entrepreneurship and success can't coexist with a scarcity mindset.
The opposite is to believe there's plenty to go around. To believe that you don't have to be better than everyone else to succeed. That you just have to be the best you can be and it will work out.