It's Just Me

Hello,
I have nobody to leave my estate to and all my family members are gone.
I am buying a plot and headstone in advance so I can see it on the plot now.
I'm even having my name put on the stone and birthdate to make sure people know who the plot belongs to and I can make sure that part is done.
Here's the problem:
Who will take care of me when I die and who will sell the house and get the money and finalize my matters?
Is there a way I can do all this finalizing now?

Who knows when that day will come but I wanna be prepared.

You should appoint an attorney or bank etc. to handle that for you.

The church or other religious body could also play a role.