Multi-destination Vacation Planning

Looking for tips to get 4o to:
(1) Keep configuration of the itinerary through out the conversation. 4o would change the presentation format, content and drop info from an itinerary it created based on my prompt on subqequent to prompts without any requests to make the change.
(2) 4o does not have the ability to auto account for Custom clearing upon the arrival of a foreign nation.
(3) 40 does not have the ability to select the right flights.
(4) 4o would fail to sort the travel web site scores for alternative destinations. For example, it would list 3/5 ahead of 5/5 even after I had repeated asked it to make the correction on the wrong sorting of destinations based on the score.
(5) 4o cannot check the correct price listed on web sites. The pricing shown by 4o is always wrong.
(6) If a flight route to an airport does not work out, 4o cannot suggest an alternative nearby airport serving the same destination.