To maximize your marketing budget in 2015, focus on engaging your audience across multiple social media platforms like Facebook, Twitter, Instagram, LinkedIn, and Google+. While Facebook's organic reach is dropping, you need to pay to promote content. Don't forget to cross-promote on other platforms and interact regularly. Traditional methods like email marketing and direct mail can also be effective if done personalized and at optimal times. Networking, sharing knowledge, collaborating with others, community involvement, and positive messaging can help promote your business with a limited budget.