Nobody that's buying the account gives a crap how many games you grinded, odds are they don't even play the same games so why would you even think that's even relevant to the accounts value? I'm assuming you spent 1000 USD or at least more than half of that amount into games/gamepasses. Which doesn't increase the value of your account at all...
People care about the real value, which goes based off limited items, and items in general. You have a bunch of generic, cheap items. Nothing rare like you are claiming, and all your limiteds are dirt cheap. Username isn't rare either, so that's affecting the value as well.
It's a 5 or 10 dollar account at most. Learn to stop spending your life savings on games, because you will never get that money back. And when the game finally dies, and nobody plays it you're going to be out 1,000 dollars because you choose to spend your money on a game that's only temporary. If you spent it on limiteds, you could've easily doubled or tripled the value of your account. Then you could've sold your account for a few hundred to possibly even more than thousand dollars..