You need to have a STRONG Password for your account especially if it does not support 2 factor authentication. There are many websites out there featuring how to create a strong password. The rule of thumb are as follow:

• Minimum password length of 8 characters
• Use lower and upper case letters
• Have numbers within it
• Use special characters such as #%+*^…
• Change it every 3 to 6 months

Lastly you can check how strong your password is.

http://www.passwordmeter.com/