So, to stay safe from getting physically attacked or getting on trap online, you must keep your bitcoin portfolio anonymously within yourself and stay unrevealed I'm both online and offline so that you don't get yours funds and life at stake on any selfish attacks.
Once you did kyc and tried to deposit your asset on cex then they know your asset or holdings but it doesnt mean other people will. Thats depend on someone to keep his portfolio kept and hidden from anyone that might be a threat. Unless cex got compromise and hackers able to get data of these and known users who got huge assets and plan to rob them. Well for anyone safety just keep it quietly.