Hi Sdon - welcome to InsideFlyer!
Any travel/points/miles questions/thoughts/etc whatsoever - just ask away here on the forums!
Re the 10k gold bonus, as far as I know, you need to keep the card post renewal as per the terms to get that (though I might be wrong, so could be worth getting confirmation from amex directly).
As regards upgrading the gold, whether you can technically upgrade or not depends on whether it's the old charge card version or the new credit card version - I wrote about this in more detail recently here:
Basically, if your gold is a credit card rather than a charge card, these days it seems like you just apply for a new plat (and get the full sign up bonus - let me know if you need a referral
) rather than upgrade or cancel the gold. That's the theory anyway, according to what Amex told me, but I'm still waiting to confirm it in practice myself (should be a few days).
That way, you'd be able to keep the gold open until you get the 10k bonus, then cancel for a pro rata refund, meanwhile doing whatever you want with the platinum re cancelling.
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