How many Web 2.0's from same domain on a site?

Well, first of all my website is big, having over 250 articles and is a wide niche. (let's say fitness for example). My SEO is not so aggresive till now having mostly blog coments, Web 2.0's and some PBN links pointing to subpages.

I am thinking to start using WEB 2.0's for each article I want to rank as Tier 1 links.

My question is:

If some WEB 2.0's are from the same domain like wordpress.com pointing to differend subpages each time, is that an issue?

How many WEB 2.0's from each domain would you suggest to use?

I find it hard to SEO a bigger website that focuses on articles rather than the homepage.. because of issues like that.

Depends on how whitehat/blackhat you want to go. If you don't care about your link profile looking natural, you can use hundreds pointing to the same site. If you're looking for strictly whitehat, I would do a handful and focus on higher quality/less quantity 2.0s.

Basically you only need one or two links from a single root domain.

Thank you for your answers, I understand that I need only a handful high quality WEB 2.0's,

But as I said my website is a wide niche and I focus on different keywords in each article. How am I going to give each article a boost? Can I link from a WEB 2.0 multiple times on the same domain/different subpage?

You better to make different websites having different niches