try Google with different keywords like: "do follow bookmark sites" "do follow high DR bookmark sites" "list of business directories + [region]" " keyword + [blog footprint]" etc. etc.

To be honest with you, both on page and off page compliment each other. Off page pushes website in SERP with the help of on page elements including meta data, content etc.

You can definitely write about tents, but you should make sure that the two articles do not have duplicate search intent. To limit this, you can search for keywords and check the SERP to see if it returns the same result for different keywords. If there is duplication in SERP, you should not write two separate articles. If there is no duplication, congratulations! You can write two separate articles.

Do these things to escalate indexing:

1. server should welcome Google bot with enough capacity
2. add sitemaps
3. check robots file if it is blocking resources
4. add quality content
5. do internal linking
6. build backlinks
7. Google usually discourage inferior zombie pages

Can you please elaborate a bit?

Google has sophisticated systems to discredit spam links, but you can avail disavow option if you want to. You can set tough robots file to block unwanted bots. Add ddos protection or wordfence type protection. Discourage scraper sites and malicious bots.

Possible if any expert can make the gist of video and share only highlights to save time.