The amount of website visitors you'll need to earn $5,000.00 per month will depend on the cost per click of the ads and what niche you're in.
Some niches pay higher than others.
But to make $5,000.00 per month from advertisements you'll need a minimum of 30,000 unique website visitors per day coming to your website.
It may take less or it make take more visitors per day to your website to earn the $5,000.00 depending on the niche and there's no way to know 100% on how many website visitors you'll need.
Just know that it's a lot of website visitors that you'll need in order to make $5,000.00 per month.