Google specifically says that only one account is allowed per person. (As an exception, if the person owns or partly owns a company, then the company can have an account in its own right.)
If Google refused your first application, then it's likely that it will refuse your other applications. If it subsequently approves an earlier application, then my guess is that the subsequent applications won't make any difference to that approval.
If three applications have been refused, you really should try to figure out why. There is clearly something Google is not happy with. Your priority should be to put that right. If you can't put it right, consider applying to a different ad network.