you obviously have a very simple financial life. As for me I have rather more than just a current account to account for including property and various fixed term savings, pensions and various other investments all of which have changed in value constantly before and after dec 31st 2023. Look at my question again and think more carefully.
your reply is senseless. I am living in Thailand off money I earned 20 years ago but have no way of proving it is not my monthly income. Think about it.
This might have been said before but I can't read all the comments!
Get 90 day non o retirement in your home country. That will make it easier to open a bank account and put the required funds into it before you apply for 12 month extension at your local immigration office.