Transfer the site database

There's a website. The site is made on the purchased and modified template, is located on Insales.
Which is not good:
Very high cost for minor improvements
Many improvements could be avoided if they got into the basic functionality of the system, and it is finalized for a long time and little.
It is very difficult to find an adequate specialist in insales.

What needs to be done:
Transfer the database of products, orders and customers of the site with the preservation of the entire structure of texts and meta-tags and redirects to all pages in the index (more than 3000);
Ideally, the structure of related products and similar products should remain.
- It is mandatory to save reviews from the page.
- Set up a new template (most likely UNI-theme) to meet our requirements

What integrations should remain:
- Loan online.
- pay anyway.
Bitrix24 (or at least not to have the attribute of noreply in the notification letters from the site - such letters Bitrix does not see)
- LiveChat.
- Vkontakte goods

What functionality should be on the site:

MAIN
Banner slider (smaller by 1/3)
- advertising blocks
Mega-menu with clickability on the tablet
- Blog (last 3 articles)
discounts (means that the goods with the changed price must automatically be received)
- new items (to automatically get here the latest added)
- popular goods
- special counter offers
Reviews - 3 extreme reviews from the general page
Company figures: cities, customers, kilometers, goods

Goods and prices
- comparison of goods
- selection of goods according to the parameters set in the adminka
- the possibility of placing a video on the main tab of the product
- related goods
- consumables and equipment - make tabs in the block of accompanying
Similar products (2 list or card display options) automatically selected based on parameters
- You've been watching - block.
- to choose an analogue (button, if the goods are not available)
- report receipt
- brands
- the ability to download instructions
import of price lists from suppliers with the possibility of partial synchronization of goods (not all are presented on the website)
- Multicurrency of the CLAD with reference to the Central Bank and to an arbitrary value (in different goods the price is set in different currencies)
- promotional stickers (several types)
- request price
- the menu should have 4 levels minimum with a clear usability system
- kits and kits
- presents
Smart search with picture tips (ideally)
FAQ about the product - on the tab, all questions-answers are collected on a common topic in the Blog

Logistics
- status of goods: available, on order (with waiting periods)
Location of goods (preferably) - in which city / cities is located
- integration with delivery of the type SDEC, Post Russia, Business Lines, PEK (preferably)
Free delivery must be linked to the order form

SERVICES
- Quick order.
- selection of goods by parameters (filters)
- I want cheaper!

CLIENTS
natural or legal person
- printed forms of receipt for payment, order and invoice for these types of buyers (preferably)

marketing
- SKU unloading for trading platforms such as "Nadavi", TIU, Market, etc. With the ability to adjust by price, profit, categories, manufacturers
- social media repost
- product reviews
- Company reviews
Integration with Metrics and Analytics
- counter day proposal
SEO filters that create an H1 page tied to product parameters
- bonus points

Order and Korzina
- when choosing a form of payment - an individual through the Bank should be able to print a receipt for payment
- the same - when choosing a legal entity - it should be possible to print an account from a personal account
- it is desirable that the related goods remain in the basket
- vich-list
- abandoned basket

Blog
- the possibility of sorting topics by category
- the ability to attach the article to the product
- Opportunity to leave comments
- share on social media

I would also like to hear your recommendations for improving the site.