My thought is it might be old / dead. I would try a new batch. Is it instant yeast? Do you proof it first?
For my sourdough breads I use a sourdough natural starter that I've had for 13 years. It takes about 4 hours for the bulk rise before I do an overnight cold rise. I use the proofing setting on my oven.
For my non-sourdough breads I use LeSaffre Saf-Instant Yeast Gold
I can never get my bread to rise! My mom says it is because it is too cold in the house but I have tried setting it on the stove with the oven on and it still won't rise! I thought it was the elevation as I did it just fine when I lived in the Valley but you are at a higher elevation than me!
Post a pic of the yeast after proofing. Do you see it foam up at all? Do you measure the temp of the water before adding yeast? should be around 105-110F i think.
If you are using instant yeast, maybe check the exp date. Could be dead like HH said.