Do you have any suggestions how to attract visitors to this type of new website?
Don't attract anyone yet - they will never come back. :/
Spend time on your design first. Site looks like a domain landing page.
Haha, by "domain landing page" I suppose you mean parked domain landing page.
Yes people come back because the site is useful to them I can see it from the ip-numbers. I dont think they come back because the website it is good looking. It is not the primary intention that this website should be beautiful.