How to organize a product catalog in a store?

Question

Online shopping

There is a store with a catalog of thousands of items. Now everything is uploaded to the site from 1C, i.e. catalog and exchange of orders, the properties in the filter are taken from the properties of the 1C product, this is exactly the problem, because content managers do not really want to do something in this system.
Tell me, if you have experience with a large catalog of goods, how to build the work correctly? That is, you need to fill the goods that come from 1C (new) somehow with information that will be useful to users and will be partially used in the filter. The case that we are currently using, I think, is not entirely correct.

Answer 1

We mainly ship only the most basic from 1C: name, price, balance, number of sales (popularity), etc. - something that can only be obtained from 1C.
I also take (not from 1C, but from the 1C Database) related products - I analyze sales for the year.
The rest is already added on the site. Image, description, specifications, etc.
We add something manually, something automatically.
That is, before publication, each product undergoes preparation.
Now there are about 25,000 products, this number is constantly growing.