Since the "Garmin is down" message last week, I no longer get any measurement except time steps, and distance.- no HR, no stress, no sleep no anything-- help, please.

Should I do a factory reset?

You aren't going to get much response on this forum, you should contact Garmin support instead, but you can try a factory reset first.

You didn't state which watch you have, but looking at your posting history it might be a vivosmart 5? in some cases just restarting the watch will fix this. Also consider that your watch might be associated with more than one Garmin account. Here is the full list of tips from Garmin's support page: I Am Missing Wellness Data in My Garmin Connect Account | vívosmart® 5 | Garmin Customer Support

Thanks!

Thanks~