There’s a very good AMEX OFFER available: earn an extra 7x Membership Rewards on Amazon purchases, capped at 2,000 points (which works out to about $300 in spend). The offer expires on July 21. Amazon Prime Day is coming up, so this is a great chance to use it.
Note that these offers generally work on almost anything you buy. If you can’t use it all, you could consider buying an Amazon gift card to save for later, which should also trigger the offer.
Check your account and see if you have it.