First of all, if your WhatsApp account is blocked, we can only help you to unblock and bury a new account for you. We have no ability to directly unblock your account.
In addition, there are no ways to make you sure that you will not be blocked. For example, we know that WhatsApp decides based on many factors, including the number you send and receive each day, network IP address, mobile phone, and so on.
We can only advise customers to use the same methods that our other customers have used to deal with.