Take extra precautions against attackers:

Enable 2-factor authentication on this account, if it is available for the service you use. This is a process that requires you to confirm your identity on an alternate device (usually a mobile phone) when logging into an account. Google, Facebook, Twitter and WordPress support 2-factor authentication.

It should be noted that enabling 2-factor authentication on Google will force you to use custom per-application passwords for applications like Thunderbird, Jitsi, Pidgin and any other application that isn’t connecting via the web interface. These can be set up in the account settings on the web.