How to find a high DA, PA website For Backlink

How to find a high DA, PA website to become a backlink, that too absolutely free please help
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There three approaches:
1. Find websites by script used - wordpress/drupal etc.
2. Check google search results in last 1-12 hours daily for keywords like credit cards, casino etc - thats niches where alot is spent on seo, so you may came across backlinks created by others
3. Make custom software to scrape internet and look for places where you can put your backlinks - thats most effective method.

absolutely free

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please help

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= road to nowhere in SEO niche.

If you want to blog comment you will need software like scrapebox.
Ands none of them are free.

Good high DA/PA backlinks won't come free unless you have a killer content that other websites want to link to.