Nothing has changed in the last 20 years retirement Visa. still 800,000 baht in the bank very much less than it was 20 years ago. And there are thousands of retirees needing to only have 400,000 in the bank since they apply prior to 2000. These amounts are grandfathered and will not be changed. If they had wanted to change it they would have done so years ago. So all those thousands of retirees who have made Thailand their home have have no problems at all and will have no problems in the future. The only possibility is that they will raise the amount required for retirement Visa but that will only be for new applicants. In your case you are in a la minority having problems to visit another country. But that's due to the pandemic not Thai immigration. Most of us are quite happy to stay here is plenty to do and see in Thailand.