Decentralization is a much broader concept. Bitcoin is decentralized, but you can use bitcoin with zero anonymity. This website is centralized, but you can still use it anonymously. Avoidance of centralized exchanges is certainly necessary to preserve your privacy, but decentralized exchanges don't automatically make you anonymous.
This is certainly true, but it's never too late to start reclaiming some of that privacy. It is entirely possible to anonymize your KYCed bitcoin, or even to sell it back and buy non-KYCed bitcoin elsewhere, and to keep that entirely separated from the private details you have revealed or leaked elsewhere.
Got your point. TBH after giving my last reply to you I went to washroom and there Ideas come to me (hehe) and I then thought I should have mention that this forum which you called centralized but we could avoid them but I think you already have the idea (no need to go washroom hehe). Well, point is I already had some idea and after reading it from you my ideas become more rigid. And One thing i learnt here is Centralized = No Anonymity and also Decentralized also means Non = less anonymity.