On the off chance that the OP is not a joke:
1) Figure out what expenditures you can make now to improve and perhaps simplify your home, for example putting in lower maintenance landscaping. Go through your home with a fine tooth comb and have anything that is not in perfect condition repaired or replaced. (I honestly don't know how one can have a home and have total expenses at your level - does nothing ever need repair?)
2) Figure out what you want to do with your huge excess of funds each month - broadly you can spend it on yourself, your family, or simply give it away to organizations / people that have some real need. If your intention is to live at your current level, you might as well start doing some good with the funds that you have.
3). Wait to do anything until after you have been retired for a bit. You might well find that your extremely low cost living situation tends to inflate as you have more free time and freedom. You can clearly easily accommodate a huge amount of lifestyle inflation without even noticing it in your budget.
Congratulations on your pending retirement - now the fun begins!