One more thing to think about as we move closer to international travel.
My husband had to renew his driver's license this year, and that triggered a review of all our other time-sensitive documents---passports, Global Entry, etc. Our GE cards would have expired in November this year, so we decided to go ahead and renew now. It can all be done online---unless they notify you otherwise.
If you haven't already registered with the new "Trusted Traveler" website, you will have to start there. We had done that previously, so just had to update some entries on the form ( employment, etc.) before submitting it. I had my approval notification within ten days, and my new card within a week after that. My husband's application took much longer, like two months. No idea why. But you should be prepared for that.
One benefit for us, besides the quicker pass through immigration and customs when we return home from Europe, is that we can use the card to comply with the Real ID requirements when they come into play, as Washington State has not started issuing the enhanced driver's licenses yet.