Exit a sequence and repeat from previous steps

I have this screenshot to help describe what I want to achieve.
From the step highlighted in the screenshot, I want to exit this and go back to the step (validateStoreUserData). Both sequences will exit on Done. What I care most is the first sequence, where a username is generated for validation. I used repeat and it didn’t seem to work for me.

If anyone can shed some light on this, I would appreciate it very much.
Thanks a lot…



Can you put both the sequences into another sequence and have it exit on sucess.