The new terms and conditions still allow for any member to be invited into the Ambassador level. You may reach out to your Ambassador to see if they may give you a goal of nights that may still satisfy the spirit of the Ambassador level even if your corporate rate doesn’t allow you to hit the $20K spending threshold.

If you’re largely staying in China at cheaper hotels/rates and presumably only getting the Ambassador perks at those same hotels, it may not be particularly problematic to elevate you to Ambassador service despite missing the $20K revenue mark.

It can’t hurt to ask! Marriott may recognize that you’re still a valuable customer based on your exceptional number of total paid nights, after all.

Otherwise, FWIW, I’m not sure that moving to another chain will ever get you better than Platinum Premier benefits with Marriott, anyway. Hyatt has a terrible footprint there, and it’s Globalist benefit is really no better than Platinum Premier, anyway. Hilton and IHG don’t have anything comparable or even as good, though the breakfast benefit consistency at Hilton may be appealing to some. So sticking with Marriott as a Platinum Premier still gets you about the best benefits you can get, especially in the Chinese marketplace.

Good luck!