calling a function with an if statement and a while loop

Question

I'm trying to make a pick your own adventure game in python and I was using a while loop to make sure that you can only pick two answers. Everything works except when the if statement gets what it was looking for then, instead of calling the function, it just ends the while loop.

choice_1 = input("\n jungle or coast? ")
choice_1_lower = choice_1.lower()

def jungle_1():
  print(" You head into the the unruly jungle to find cover and come across a small \n cave that looks to be empty.\n This would be a perfect spot to setup camp.\n\n In order to get to the cave you have to cross a river.")

def coast_1():
  print(" You wander the coast, your skin still aching,   looking for any sign of \n wreckage. \n\n it's been 3 hours, you don't find anything.")


while choice_1_lower != "jungle" and choice_1_lower != "coast":
  
  if choice_1_lower == "jungle":
    jungle_1()
  elif choice_1_lower == "coast":
    coast_1()
  elif choice_1_lower != "jungle" and choice_1 != "coast":
    print(f" This is not a choice. {choice_1}")
    choice_1_lower = None
    choice_1 = input("\n jungle or coast? ")
    choice_1_lower = choice_1.lower()

I've been brainstorming and I don't have any idea how to keep the function of the while loop while also keeping the function of the if statement.