Barter: Backlinks by Articles

Hi, i`am from another segment of network (ru\ua\by), at the past year i was create 10 websites in EN segment US+UK, today, every domains has MOZ (DA/PA) 40+/50+, majestic (TF/CF) 20+/40+, RD ~1-10k, but hasn`t unique content (only copy-past) and so visitors stats is low <100, how to craft nice articles in these segment, can i provide free backlinks by articles? barter\swap\exchange - don`t know how this is named here) will be glad for some useful tips, thanks)

i think it's called guest posts. You want people to post articles on your site in exchange for a backlink right?
I would be interested, I have some spare unique articles. But I will only post if the sites in your portfolio are relevant to my niche. So please share the broad niche of your sites and say you are accepting guest posts on them. Some people maybe interested.

"guest posts" - yes, thanks. Where the best place to find "guest posts" ? here? some services?
Someone do this like "by pack" (i mean quantity)?
What is method much better and popular? Sell copywriter work (time) by mine requirments or take the written article by "guest"
Not posting yet, sorry, soon... for example: medicine, business, law, magazine, tech, science etc. (common niches)
thanks)

would be better do some "gust posts" page on these websites or nobody use this tool?)

PMed you.