Hi, I am Amirul Islam Amun, after seeing this thread I am thinking about my startup. Few month ago I started my new business which is a online shopping site. After publishing my website I felt that I need lot of advertising. Before that I worked in a marketplace named contentmart. I worked as a copy writer and sometimes I did SEO. By the way, that experience helped me in advertising. I used facebook and instagram to advertise my website. So, I think there is no limitation in advertising. If you have product and you can serve than there is no limitation to attract people towards your business.