Organic is different. Matching keywords to user intent means you may be present in many searches. The user may find you consistently, and once they get to your site, they are more likely to stay. Organic users are still your best long-term customers. In my experience, they have lower bounce rates and more pages visited, and they are more likely to return.
If Google finds two identical pieces of content, whether on your own site, or on another you’re not even aware of, it will only index one of those pages. You should be aware of scraper sites, stealing your content automatically and republishing as your own. Here’s Graham Charlton’s thorough investigation on what to if your content ends up working better for somebody else.
You can’t build a sustainable growth strategy based solely on paid users. However, in this day and age, it also isn’t reasonable to expect a fraction of organic users to deliver sufficient revenue for your business. With non-organic traffic, you are in the driver’s seat, and you can drive scale by relying on data to optimize your campaigns, while with organic traffic you can increase your ROI. You need a combination of both in order to propel your app into fame and success.
Regarding Link Detox, links it diagnoses as Toxic are generally fine as they're either not indexed by Google or have malware/viruses/etc., but I recommend a manual review of any diagnosed as Suspicious. I used it recently to get started cleaning up our backlinks and some legit sites and blogs were under Suspicious simply because they didn't have many links pointing to them.
Of course, you can buy traffic but if you won't build up organic traffic sources over time, your business will become dependent on the amount of budget you spend on advertising. And advertising costs doesn't stay the same. Most of the time if it gets more advertisers, the costs are going up. And suddenly your profit can disappear and ROI can become negative.
One important thing to note is a website’s domain authority (DA) and page authority (PA). This is a number from 1 to 100 that indicates the strength of a website’s domain or a specific page. DA and PA are two of several factors that go into how a website will be ranked on a SERP. The higher the DA and PA, the better the chances are of that webpage ranking on the front page of a SERP (everyone’s dream!). This number is determined by a few things, such as the age of the website and number of links leading to it (backlinks).
If you already have the list then you should definitely be taking advantage out of that. All the top marketers say that "money is in the list" and there is a good reason for that. If you're not building your list then you are missing an opportunity to reach your leads that has a higher interest in you than traffic from anywhere else. You can keep your community updated, send newsletters, special offers, surveys, tell stories, use it for affiliate marketing and so much more. It's not dependent on any algorithms of social media and search engines that can narrow your reach many times.
Add as many email forms as you’re comfortable with on these pages (some users dislike sticky headers and pop-up forms). You should also integrate them with lead magnets that relate to the content on the page. For example, a fisherman’s About Me page could feature email opt-in forms that contain a lead magnet for a free, short ebook called “A Day in a Fisherman’s Boots” where he depicts his fishing routine from the moment he sets up his gear at home, to the actions and decisions he makes when things go awry during a trip, to when he finally reels in a catch and more.
Plan your link structure. Start with the main navigation and decide how to best connect pages both physically (URL structure) and virtually (internal links) to clearly establish your content themes. Try to include at least 3-5 quality subpages under each core silo landing page. Link internally between the subpages. Link each subpage back up to the main silo landing page.