Social sharing for old blog posts???

I need to find a service that can take all my old blog posts and get some likes, retweets, pins, etc. (whatever is appropriate) to them. I have about 130 to 200 urls I want to get some kind of shares, bookmarks, backlinks, etc to.

A lot of the pages already have a few links but I want to get them a little more. Obviously I don't want it done in 24 hours. Old posts generally get less activity than new ones and I think it would be hard to explain a really dead site all of a sudden getting a bunch of activity.

Where should I look to find a service like this. I don't want 10 FB likes and 10 Retweets, and 10 Pins for each page. The sharing should be across numerous platforms, with varying amounts of shares on each platform, and come from a lot of different accounts.

Is anything like this our there? Do you have a different suggestion?

How am I going to make my old posts look like someone had a little interest in them.
I don't want this to put any of them on page 1. I just want to show that people actually read the posts. I just want to bump up the Trust Flow and Page Authority a bit.

I would be open to any sort of idea on how to accomplish this.

Thanks for taking time to consider my dilemma.

P.S.
The high authority site in my niche (addiction) are either government sites or hospitals. They are not going to give me a link. So I think I need to show some kind of popular support.