Contact your NetSuite Admin and ask them to enable Soap web services for your role.
Your Admin will likely know how to do this already or they can follow the steps below.
Navigate to Setup > Users/Roles > Manage Roles.
Locate the role you want to modify. Click the corresponding Edit or Customize link.
Click the Setup subtab.
In the Permissions dropdown list, select Web Services. If you are on NetSuite 2020.1 or higher select Soap Web Services.
In the Level drop down list, select Full.