Can a Website Solely Rely on SEO for Traffic and Sales?

I’m currently working on a streetwear website and focusing all my marketing efforts on SEO. Right now, I’m not using any other channels like paid ads, social media, or email marketing I am only doing search engine optimization. I’m wondering if it’s realistic to rely solely on SEO to drive traffic and generate sales. Has anyone here successfully scaled their website using just SEO, especially in the e-commerce or streetwear niche? What challenges should I expect, and how long might it take to see consistent results? Would love to hear any tips, experiences, or alternative strategies you’d recommend to complement SEO.