Membership.
You keep your practice, your clients and your name. What you gain is the machinery independent work rarely reaches: engagements worth having, a governance system that makes your work defensible, and colleagues who have done it before.
Three ways in
You can hold more than one. Two of the three require no cybersecurity background.
Membership is by sponsorship
There is nothing to pay before you are placed on work.
The firm carries the back office
Contracts, invoicing and collections sit with the firm, which holds the client agreements and performs none of the client work.