Refining the site is required

Good evening! We have a website. You need to configure the CNC correctly for OpenCart. Also, improve the catalog and conduct internal optimization of the site! In a word, make the site convenient for the consumer! You can also make your recommendations on the site, as you are specialists and know how to increase site traffic, etc. We have 44,000 pages on our search and 20,000 pages excluded from our search. I asked Yandex they said it was nothing wrong. Although I opened the excluded pages from the search copied in the Yandex line and they are still in the search on the first page. I don't know how that is.