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You generally want to use your credit cards on a semi-regular basis, just to maintain a history of usage. Otherwise they will get cancelled eventually. Every card company and card type though has different stipulations. Some never cancel, especially those with annual fees. Others will after 6 months - 1 year of inactivity.
If you want to maintain that $50k available credit amount, then I would suggest using each card (except the store cards obviously) for exactly 1 recurring charge. Like a bill you already pay every month - Netflix, electricity bill, internet, etc. Something you can setup on autopay.
And, this is important, pay off that charge every month on or before the due date. That will keep your cards active, but will have you avoiding any interest from ever being charged. That's the trick. And another plus, if your card gives cash back rewards, you get a small discount/reward for doing this.
I have a Discover card that I only now use for Netflix. It has a cash back program. So, every month I get my bill and pay Netflix minus my 17 cent (not much, but something) cash back from the charge, and then always keep the balance at $0. But the card stays active and helps my overall credit age, available credit and overall credit to debt ratio.
If you don't care about your available credit, or fear having $50k is too tempting to fall back into debt, then consider cancelling all but 1-2 of them. Keep your oldest ones active, ideally the oldest accounts with the highest limits. Because reducing your average credit age or your overall credit limit both can lower your credit score.
As for getting a house, if you have a 800 score or above, you are just fine. No more need to 'play the game'. You already won. You don't need to go into hundreds of thousands of dollars in debt just to push for 850 or whatever. Wait until you have a reasonable down payment and the situation and home is right for you. I wouldn't rush it.
Congrats on the high score.