Bread dough that won't rise properly is so disappointing. Cool air or old yeast are the two possible culprits.
To revive the yeast, first try introducing bit of heat. Fill a large pan with boiling water and place it in the oven on the lowest rack, or heat a mug of water for 2 minutes in a microwave. Place the dough (in its bowl) in the container with the hot water. Leave it to rise.
If that doesn't work, you can mix a little more yeast into the dough. Mix yeast from a new package with 1/4 cup warm water and 1/2 teaspoon sugar. Let it sit for 10 minutes until foam forms, to be sure the yeast is active. Knead the yeast mixture into the dough. Leave the dough in a warm place to rise.