I didn't understand if there is a problem

Hello friends, I have a request. I have a website, Yenibigiyim.com, but there is an issue. The site is 6 months old. In the first 3 months, all the topics I posted would rank on the first two pages. I had even reached the 3rd page for the keyword “modest clothing,” but now I am on the 6th pages. I don’t follow the traffic much, but it averages between 150 and 300. I even managed to make it appear with sitelinks like this to keep them there: Google Search. However, either something is missing or something is excessive; AdSense yields 1 - 1.5 TL daily. I left it alone for a month. Now I’ve handed it over to a lady who posts 3 articles a day. What is your recommendation for me? What can I do? What tools can I use? What is your suggestion regarding social media? We have 50-100 different accounts on many social networks like Pinterest, Twitter, Facebook, LinkedIn, etc.

Sosyal medya hesaplarını etkili kullanmıyorsun
Elinde 4000 kişiden fazla insan var sen bunlara daha siteni tam anlamıyla gösteremiyorsun elinde olmayanlara göstermeye çalışıyorsun (google)
Sen önce seni takip etmek isteyen ziyaretçilerine bi kendini kanıtla hepsini kazan.
Paylaşımlarını etkili ve ilgi çekici bir görselle birlikte link şeklinde yap.
Ondan sonra diğer kısma geçersin.