But for the sake of your anonymity then just have to choose another address with that private keys that you own.
Using fresh addresses is good for privacy, but just that alone does not make you anonymous. Even the BTC blockchain is public and transparent and then if you send your funds into centralized exchanges, you obviously no longer have any privacy to protect.
Yeah, when you send btc and it steps to the exchanges then you're no longer anonymous and they've got an idea already on who you are since most exchanges today require kyc unless you use the non-kyc.
If you want anonymity or a much better privacy, you must first be running your own node, once you connect to third party servers, the host already has information about your IP and your BTC address, you must also use p2p exchanges and privacy solutions like CoinJoin implementations.
I agree, solutions like that will increase your privacy.
I have used my wallet address many times. If the amount was more than $15,000-30,000, then I will create a new address.
Well, it does not really matter at all but on this case just as what everyone is telling. You do what makes you feel safe and private.