A lot of online publishers here have blogs with high traffic, but "high traffic" depends on the niche.
Some niches, especially the finance and insurance sub-niches, have relatively low traffic volumes.
But don't let the numbers fool you.
Sure, a lot of these niches might have a much lower volume than celebrity sites for example, or gossip websites, but they make more money per click from that lower volume traffic because of the high financial value of their niche.
If I were you, I wouldn't obsess about "high traffic."
Instead, I would focus on the commercial value of the niche of the blog that you are building or that you want to build a partnership with.