Kindly confirm, is it possible to save Player position in level designing without Playerprefs in unity

  1. Actually I do not want to use Playerprefs to make Level designing
  2. Is there any best approach to make level designing without Playerprefs in unity so kindly share

Yes it is.

I never use player prefs for anything. It is only supposes to be for settings like volume and difficulty etc… because it is not secure. Not sure what you mean by make level designing without Playerprefs, what are you trying to save? Anyways, scriptableObjects is the solution for design, all the data is persistent, in or out of playmode and between sessions when using the editor, if you need more persistence than that you can save the SO to a text file, probably in JSON format.