Hi did you submit your website to search engine ? Have you done a seo job on your website ?
I can ask basically like 1000 question here (no offense) its just because your question is so vast we cant really answer we dont know what is your website and what you have already done.
but in general basic step is : SEO job Search engine submission Back link Social media posting Build a community in general News letters can help too (depending what is your website related to) Give your user a reason to stay and share your website