Sript to unsave all saved Instagram posts. Uses Instagram private API by ping and its extensions to do the heavy lifting.

unsaver.py

from instagram_private_api import Client, ClientCompatPatch
from instagram_private_api_extensions import pagination
import json, time

user_name = 'UserName'
password = 'PassWord'

api = Client(user_name, password)

items=[]
for results in pagination.page(api.saved_feed, args={}):
   if results.get('items'):
        items.extend(results['items'])

print("Starting unsaving posts.....")

for i,x in enumerate(items):
   z = items[i]['media']['pk']
   api.unsave_photo(media_id=z)
   time.sleep(3)
   print("Unsaved: ", z)

403 forbidden likely cased for abusing the API. Try after using a VPN and make sure that account doesn't have 2FA enabled.