The best thing you can do to secure any online account is to set a strong, unique password then ‘lock up’ the email addressed associated with 2 step verification, phone number logs etc.
Lots of people put their online presence at risk by using weak or the same passwords across multiple sites.one of the top passwords is still password123 or qwerty. Fiverr is pretty secure with SSL encryption, security questions etc but another site may not be. If that site is compromised and you’re using the same details, you’ve just compromised your fiverr account.
The point of failure of losing your laptop whilst logged on can also be an issue. To protect against this, I recommend altering your browser settings to not store cookies and to destroy sessions on browser close. That way, you will not constantly be logged in.
One thing fiverr is missing is an auto expiration of login. I.e I could be inactive for a day, refresh the page and still be logged in. Ideally, it should destroy my session to to inactivity and ask me to login again. Facebook doesn’t have this either but they check for other criteria such as unusual login locations or ip addresses.