Something must have changed on the server. It might not be a changed password, but for example the password might have expired or your account might have been disabled altogether. Please talk to your server administrator.
See also: https://winscp.net/eng/docs/message_access_denied

Hello
I've been using WinSCP for a long time, and nobody has changed the password.
These days I was trying to log in but it shows access denied.
The server is also working fine after checking.
The internet environment is also fine.
I also try to log in with different device, all of them shows access denied.
Here is the log data.