Help! My tree is falling
You can try attaching 2 guy wires on the other side at a 45 degree angle to each other and gradually tighten the wires over the next 2-3 months to bring it just past upright. Then leave the wires in place for a year and a half. Use a section of garden hose around the wires where they contact the tree to avoid cutting into the limbs and check these areas periodically.