You would be immortal and all basic amenities essential for physical survival would be provided. You can have the age of your body according to your choosing and your mind won’t blow off by accomodating endless amount of memory.
You can choose anything you desire and that too at any instant which may or may not exist in real life, like an endless supply of something or a companion with the same immortality powers as yours, but you won’t be able to change it in the future and there would be no going back. Also you cannot alter your mind in any way that would enable to let you tolerate living for eternity or not get bored of things.
Ideally you would want to have everything just to be sure but by asking you the minimum requirements, it would making it more interesting to know what you think you could do without or what matters to you the most.
Honestly I’d need it to not be 100% permanent. If the earth gets obliterated I’m not interested in swirling in the void forever. If a government figures it out and keeps me locked to a table for decades, I want to be able to die.
If you give me the ability to concentrate and stop existing, I’m in.
I’d bargain down to a torpor state if death is right off the table. It might be interesting to be found floating in space by space faring sentients in the far future.