Asgardeo offers a Self-Registration Flow Builder (currently in preview) designed exactly for this scenario
Create multi-step or conditional signup processes:
Classic email + password registration
Social connectors like Google (built-in widget)
Post-social-registration UI screens to capture more user info
Option to link social login with existing email/password accounts
Handles verification emails, OTPs, UI rendering — all customizable with drag-and-drop and even AI-generated templates.