Residency question

No, you cannot get approved for permanent residency in Ecuador before leaving if you have only completed 90 days.

To qualify for a permanent resident visa in Ecuador, you must hold a qualifying temporary residency (such as a professional, investor, or pensioner visa) for at least 21 continuous months.

You must apply for the permanent residency visa before your current temporary residency visa expires, meaning a 90-day tourist stay or a short 90-day period is far short of the legal 21-month threshold.