Need Some Marketing Strategies That will Boost My Brand

Hello, need your help in choosing marketing strategies for my business. Already tried many advertising strategies but none of em showed any visible changes in sales. It's been three years since I started and now the competition is higher than ever before.

The conventional marketing won't be enough In this saturated market. So I'm gonna need a unique marketing approach. So I did some digging on the web. Learned about Guerrilla marketing and found some really cool marketing strategies.

Street team promotion is one of them. It's cute, mobile, well targeted and will grab people's attention. I think it's perfect for my business. Plus I already found an advertising company providing cool experimental marketing services.
Though I would like to hear from you guys before hiring em. If you have any better ideas please share it.