A memory foam mattress topper. Mine is 8cm (3") thick and an absolute game changer. It goes on top of your existing mattress and under the fitted sheet.

One of those stupid expensive real down feather pillows. I spoiled myself one year for my birthday and only wish I had done it sooner. I go to bed every night and thank myself for getting that pillow.

A car. Insane freedom, I can take a day off work and drive to a secluded beach on a whim.

A bidet spray...

Think of it like a kitchen faucet spray for your ass, after taking a dump...

But otherwise, take an empty disc top shampoo container and use it .

gifted a dry-soon https://www.lakeland.co.uk/21736/dry-soon-3-tier-heated-airer - fancy thing that I wouldn't consider buying myself in an hundred years, but actually a drying rack with a built in heating element is an amazing thing to own. way cheaper than a dryer (not that any of the rented places I've stayed in have had one) but can still reliably dry laundry way better than even sticking it on radiators or whatever

A private jet, it's amazing being able to just show up at the airport whenever you feel like it, not have to go through any security, step on the plane and just take off and be wherever you want a few hours later.

A swiss backpack. Loved it since I got it for Christmas, the most useful item I will ever own