What to do now, in an empty house?

My three kids are gone. All have grown and pursued their lives. My husband travels a lot and it was a strain. Now he is my ex-husband. I have a lot of life left in me, but I feel very lonely with an empty house now. I’m not really a craft type of person. I don’t belong to a Church. I don’t go to bars. I can’t afford to travel. I don’t know what I can do with my days to feel less discarded.
Any suggestions?