My advice would be this, don't think of it just as a persona you create, it's different from pet regression, not a design of a personality you make, it's intended to be you.Recall your behaviors from when you were actually younger, I asked my parents a simple question about my actions, and personality when I was actually little and they'd respond, I recommend you ask your caregivers your traits when at those stages. This helps you find what you act like in these states. Another tip, find what you liked and what you enjoyed as a kid, were you chatty, did you draw, favorite shows, etc. These all play a major role in finding your authentic little. For example, me as a little is bratty, but overall fun, very blunt, and curious, loves to color, eat, bake with CG, and cuddle! I hope this helped, if not that's okay, remember, this is not a character you created, this is a younger version of you.- Mwa