Help & Advice needed

Hi all, I have recently launched a new 3D printing online shop and I am really struggling to get website traffic, let alone a sale... I have been doing SEO research but even though I seemed to have done everything I can do with regards to SEO on my website, I am still not getting any organic traffic or sales etc. Even though I have been doing web design etc for years I feel really out of touch with the SEO & Marketing side of things, lost even? I get the feeling that the only way I am going to get sales is by spending a massive chunk of change on advertising with Facebook or Google etc... Is paying for web traffic the only real way to get it these days?! 🥴