Was the buyout offered to a lot of people, or are you in a select group chosen for it? It seems incongruous to me that they would be seriously considering you for a promotion yet simultaneously offering you a buyout. I guess what prompts this question is I have a friend who had been with his company for 26 years. His company was acquired early in 2025 and he was offered a buyout back in June, which he declined. At the beginning of December he was informed he would be “laid off” effective Dec 31 with no further compensation.
Given that your personal life is currently unsettled and you are unsure of the financial ramifications, I would recommend taking the promotion if offered and getting those finances stabilized so you have a greater degree of financial certainty surrounding your retirement. Good luck, and I’m sure you will figure it out whatever you decide. There is rarely a single correct answer so you can probably make any situation work, but the prospect of losing half your retirement savings at this age would move the needle into the “keep working” direction for me.