First let me congratulate you on 60 pounds loss - that is an amazing and wonderful accomplishment. I hope you are doing lots of pats on the back, dancing around and enjoying your achievement! I can't say much to motivation - as you see I'm still a newbie, but there are some amazing groups and threads on all sorts of subjects.
Plateaus are one for sure! It seems everyone hits them and I know when I hit mine I'll need lots of extra encouragement.
I've really loved being here - it keeps me motivated DAILY (which is everything). Great folks and I hope you have as much fun as I am! Look forward to your continued success!