Identify the sort of person or company who has the problem your product is seeking to solve. Who are they? Where do they hang out online? What other things are

Identify the sort of person or company who has the problem your product is seeking to solve. Who are they? Where do they hang out online? What other things are they interested in? Start writing stuff or creating giveaways that are of interest to those people. You are not writing about your product here, you are writing stuff that appeals to your target customer - hopefully with some sort of link to your product. You can share that content and/or free stuff far more easily than promoting the product as long as it is good quality. An example: My product is a CMS, built for web designers and front-end developers. Writing about content management in our product is great for our existing customers but is less likely to bring in new people. However if I write posts on my own sites or on other sites that are genuinely useful content for my target audience then those people are far more likely to go on and look at my product. So I write about CSS, workflows and so on - thinking about the things that our product does really well so I can throw in a quick mention, but not making the article about the product. You have to be quite targeted about this, and it isn't a "quick fix" but it does work very well. People will share free useful content far more than they will share your landing page.