Can I get back my Xbox Live GOLD subscription back after I cancelled Ultimate pass?

Can I revert my Xbox Game Pass Ultimate back to my Xbox Live Gold?

Do not.

what you can do is cancel your Ultimate subscription and subscribe to Live Gold again.

Ultimate Game Pass can't be converted back to Live Gold and if you cancel Ultimate Game Pass you will lose the Live Gold, so it is best to turn off recurring billing and wait for the Game Pass subscription to expire then get Gold after that.

Currently I have Game Pass Ultimate subscription with recurring billing off and don't want this subscription service once it expires 10/22/22, so do I just activate my prepaid xbox live gold subscription card on 10/23/22, or do I actually have to cancel game pass ultimate subscription for my account on 10/23/22 manually before redeeming and activating my xbox live gold prepaid 12 month card on 10/23/22?

Also, if you select turn off recurring billing on your account for your current game pass ultimate subscription, does that automatically cancel your prepaid game pass ultimate subscription on its expiration date? or is it requirement that you still manually cancel Game Pass Ultimate on or after its prepaid expiration date if you wish to switch back to xbox live gold using a prepaid subscription card?

You would be best placed to create your own thread.

If you are referring to losing Xbox Live Gold because you cancelled Game Pass Ultimate, there is nothing that can be done. It clearly states that Xbox Live Gold will be converted to Game Pass Ultimate days and can not be reverted and that canceling Game
Pass Ultimate will cancel out the converted Xbox Live Gold. https://support.xbox.com/en-US/billing/xbox-subscriptions/xbox-game-pass-ultimate-faq

You can cancel your Game Pass Ultimate membership at any time, and you will
continue to have access to your Ultimate benefits until your prepaid time ends, at which point you will not be charged again.

Note The upgrade of any prepaid time to Xbox Game Pass Ultimate cannot be reverted back to Xbox Live Gold or Xbox Game Pass, and you cannot receive a refund for Xbox Live Gold or Xbox Game
Pass. You can, however, rejoin Xbox Live Gold or Xbox Game Pass when your Xbox Game Pass Ultimate subscription ends

Yes, you can cancel Xbox Live Ultimate whenever and revert to only Xbox Live Gold.

So, when it says "Purchase of Xbox Game Pass Ultimate automatically upgrades your existing Xbox Live Gold or Xbox Game Pass membership(s) to Xbox Game Pass Ultimate at a conversion ratio each based on days remaining. Future
code redemptions are also subject to a conversion ratio. Conversion ratio subject to change. All conversions to Xbox Game Pass Ultimate are final: Once converted, you cannot re-convert your Xbox Game Pass Ultimate membership back to a previous membership.",
it means if you activate Xbox Live Gold subscription when your subscription of Ultimate is still active. ¿Am I right?

I think after activating ultimate, if you redeem a Xbox live Gold, it will extend your ultimate subscription.