How to make my self a unique visitor

you can use some proxy site. so, your IP will change. but not for all site. and as you said second time. so, if you go there next day you will be still new(unique) user these is for most sites. some sites may store your ip but that's very rare.

You can try using online proxy server like hidemyass but depending on the site you are visiting, it may or may not work. Some site may scan for your machine ip and it is harder to make youself seem like unique visitor. There is one program from china that allow visits to a url you put in perhaps you want to try it. The program is called jingling

It totally depends on how the site is set up. If you delete cookies and register as another user sometimes that works. But if it solely goes by the IP address on your computer you will not be able to do it. You can cheat the system by using another computer like a laptop or something though.

You could try using the anonymous browsing feature that most browsers have now. It will prevent cookies and the like from being stored on your machine. It won't change your IP address, but that is not always necessary for some sites, as they don't track that statistic because it is not reliable for determining unique visitors. An example of that is a coffee shop with WiFi access. All users have the same broadcast IP as far as the Internet is concerned, as it is generated by the router in the shop. The router in turn assigns unique IPs in the protected range to individual users via DHCP.