How can I get more exposure to my website, as some types of advertising are very expensive?

[Fanaticallunch812]

"I think that large exposure would increase the sales of my ebook."

I absolutely disagree. Wide exposure means to me that you have no target which pretty much guarantees that only about 0.5% of folks will be interested (just as cold direct mail) which means that unless your book is $100 it's not gonna make a profit.

So either figure out your target or waste money.