The marketing industry is a difficult yet rewarding industry if you’re able to push your way through the challenging requirements for your marketing strategy to become successful. It’s common for marketing professional to have experienced failure before they’ve been able to succeed in the industry. Even the biggest and most successful entrepreneurs have experienced failure before becoming successful.
When I started out in agency world, it was the big brand agencies who every company wanted looking after their brands. Fast track 20 odd years, and now it's the small agencies and startups that are completely disrupting the market.