Link building creation

Hello.
It is good for OffPage SEO to share all website posts every day (more than 50/day) in this social media? Or it is waste of time?

Plus i add this posts and in bloglovin profile page.

And, what you think about panel.seoestore? It is worth to spend money on high DA backlinks for the main website, and all of others cheap backlinks for this sattelits (bloglovin page, tumblr, wordpress, blogger sites)

Thanks in advice

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