What can I do with a white metal reindeer minus the Christmas lights ?

Spray paint it with Rutoleums 2X for metal and use it as a focal point in your garden

Put it in your yard anyway. It will be visible during daylight hours. Or, you can buy a cheap string of lights--maybe fairy lights--all in clear or white, and put them around the reindeer as if they were its harness.

Get a long string of white wired lights and wrap it around him!

Get rid of it and start over. It's too much electric and extension cords. Create a wooden one instead

You can spray paint it any color you'd like :)

If the lights don't work you can easily illuminate with a small spotlight. If you don't want lights at all - wrap him with alternating red and white garlands (candy cane ) and give him a nice big bow.

If you do choose to wrap new lights around the deer, just a heads up tip here that sometimes when you wrap lights around an object of a particular shape, once the lights are turned on, then the silhouette of the object is lost. Unless you want to spend a few days, and evenings fiddling with wrapping and rewrapping, I would say the quickest way to light Rudolph up at night would be to use a spotlight.