Use Two Factor Authentication

If the wallet offers a two-factor authentication (2FA) take it. This means that if someone had access to your login details,
 they would also need your phone to get the 2FA code.
However, note that text and email 2FA are not recommended as these can easily be intercepted
 if someone has access to your email, or ports your phone number to a new device.

in order of most to least secure, are as follows:

Hardware dongle, see: https://landing.google.com/advancedprotection/
An app on your phone that doesn’t sync your secrets anywhere (e.g. Google authenticator)
An app on your phone that does sync (e.g. Authy)
Email based
SMS based