Still tight around my chin and ears 12 months after facelift. Can I do anything to help the healing?

This is the fine balance that has to be achieved in effective facelifting. Aggressive facelifts that involve "over-tightening" of the platysma, "over-resection" of skin will "look great" for a while but introduce a lot of tension in the face and neck that can feel and look "over done". Whatever the case, it is good that you are happy with the way you appear. I would suggest, with the permission of your surgeon, seeking out a lymphatic drainage therapist who might be able to help soften the feeling of tightness that can result from persistent swelling, scar tissue and various other biomechanical changes resulting from the facelift. I hope you found this advice useful!

First, you should see your surgeon and ask for their guidance. Tightness typically does dissipate with time, but it's been awhile for you already. Assuming your surgeon doesn't seen anything untoward, you may be a candidate for a deep tissue massage of the region or even lymphatic massage/drainage, but get your surgeon's opinion before undertaking anything like this.

Regarding the numbness, discuss this with your surgeon. Help map out the regions of anesthesia with an eyeliner or erasable marker to aid in the conversation with your surgeon. Small areas of numbness over incisions is not unusual, but entire regions of anesthesia are concerning, especially since it's over a year, for permanent nerve damage.

Hello ! Thank you for your question I have tried to evaluate your case from the information and photos you provided. Without your face photos it is very hard to make an evaluation of your case. If you could provide photos and more information I would be able to evaluate your case in a more appropriate way.
Thank you ! regards