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.