In the past, many affiliate marketers focused on a catch-all approach, offering traffic up to hundreds or thousands of sites, even if they had little authority or traffic to give. But in 2018, advertisers will laser their focus into smaller groups of highly credible, targeted, and popular influencers. To map your strategy, focus on a few key influencers in your industry. Start with them, then nail your niche before expanding outward.
If you have pop-ups and optins on every page, I would have to think that it would be a lot harder to convince someone to link to it. Especially since the pages where you have your optins (and probably receive the most traffic) are probably the same pages that you have your best content on as well that you'd be hoping to pitch in your outreach campaign.