I need 20 Unique Do Follow Backlink For My Website By Using Article/Guest Posting & Web 2.0. I will Provide you Article.

I want 20 Do Follow Backlinks For My Website From 20 Unique Sites. I had made some backlinks previously so I can't want to repeat that website. Hence you are required to make backlinks from those site which I can't use previously.
The Site Characteristic:-
Method That You Can Only Used
1. Article Posting
2. Guest Posting
3. Web 2.0
4. Link Abc