Sustainable Marketing Practices for a small scale brand.

In today's digital marketing world, it has become increasingly challenging for small scale brands to reach customers, organically, without having to spend a disproportionate amount of money on Facebook ads. Even targeted ads do not bring the anticipated conscious buyers that a small scale sustainable brand deserves. With increasing competition from window dressing sustainable giants, what are some marketing techniques that guarantee customers without compromising on a brands vision or marketing budget?