I just received an offer - spend $7,400 on travel purchases (not just United) and earn 7,400 bonus miles or $10,000 on all purchases and earn 7,600 bonus miles.

Register for this offer by March 15, 2024, and book and pay by March 31, 2024. Purchases made between January 1 and March 31, 2024, will count toward your bonuses. Bonus miles are in addition to the miles you already earn for using your card.

One-click registration and no need to choose which offer. Not much incentive but better than nothing.

Link: https://promo.united.com/offers/bookforward