OP, because you yourself understand your need for security from the browser you use to access the forum. or any wallet extensions you may be using. if indeed you experience an unpleasant, or suspicious experience from your browser. You can secure your account in the way that you have used it.
there will be no problem with changing your account password. or even if you change your email when you can't access email. if you are the account owner.
That is the right if he is the original owner, because what I know is changing the password and email only to increase security to prevent unwanted things, for example, doubts with a password that is not strong.
So for the OP it's not a problem it's up to you to change it or not what is clear is that several other people have also improved this.
but to clear any doubts from forum members, since indeed you have opened this thread, you can sign messages with the BTC address you used for the past year or even older. not with the address you just posted this year.
I don't think the OP has ever staked a BTC address in the "
stake your bitcoin address here" thread so this would be very confusing if he wanted to sign his btc address message.