We need some advices for our e-commerce site

Hello, our site called [url removed, login to view] was very good on SEO in the past but something is happened. Now we can't find many of our titles in google. I checked that our website is not banned in google but something is wrong and we need advices or fixes. Thank you in advance.

Beceriler: Elektronik Pazarlama, Link Oluşturma, Pazarlama, SEO, WordPress

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Proje NO: #6522886