Bludit Upgrade and Feature Enhancements

I have a BludIT website that is already modified. It requires further modifications:

1) upgrade the Bludit website version 3.15.0 to the current version 3.22.0.

2) Image captions & description

For images with proper captions, description as in WordPress.

3) search possibility of image via image caption

In the Admin Area there is a possibility of searching an image via image caption, but it's not functional.

4) Multi-site functionality

If I publish an article it must also publish on the other Bludit websites, including all images, description, published dates etc

5) Mobile navigation

The navigation menu is cut off on the right-hand side on smartphones.

6) Remove Comments

The following English text appears in the comments section: “No comments yet. Be the first to comment\!”

7) Advertising banners

There are advertising banners on the left and the right side of the website, that shows only a single Ads, I want to show more Ads on the two sides. Besides I want to show more Advertising banners in the header and footer area.

8) Facebook: Use featured images instead of the logo

while pasting the article link in the Facebook, it publishes the logo and the article description, without showing the feature image.

9) using RSS feeds from external websites to create new post and post them as draft.

10) Embedding PDFs in Articles.

11) Every page needs a button with the following text: "subscribe the website"

When clicked, the button should redirect the user to subscribe page.