A place I am staying long term for work has this old Kenmore Microwave and it was missing the handle. I drew this up and printed it for a replacement handle. Pull the little caps from the inside of the microwave door, unscrew the screws (you may have to pop the trim inside the door), put the new handle in the holes, reinstall the screws, replace caps and you now can open your microwave door again.
I printed this laying on it's side with no supports.
The replacement handle is no longer available from Sears Parts Direct. The two website screenshots are from the website below.
https://www.searspartsdirect.com/model/1pmhfe1b6m-000582/kenmore-7218965581-countertop-microwave-parts