@BlossomBxbblez no problem!
Each journey is different, but for me I realised I was ready to move on when I had completed the steps of m shifting, was fully able to visualise my mer form, and had lots of m flares, particularly when meditating or seeing something that felt connected to the ocean.
But like I said, each journey is unique. Although completing the steps of the m shift is best before you decide to move on. It can be dangerous to p shift if you haven’t mentally prepared yourself.