How to properly model an linear power supply with LDO in LTspice?
If you want to understand how LDOs work and how to simulate them i suggest much more reading. https://www.analog.com/en/analog-dialogue/articles/low-dropout-regulators.html is a decent start and I'm certain you could find a lot more.
Alternatively you could use a SPICE model of a LDO IC that is close to the one you have. You can find some at :
https://www.pspice.com/models/rohm