HIGH ELEVATION BAKING

I recently moved from Phoenix, AZ to Soda Springs, ID and I can't bake anything! I was just trying to make a simple zukini bread I could make in my sleep before. Now holy cow; it rose up and fell. I looked up about higher elevation baking and removed some sugar, levening and added a little more liquid but nothing really helped it to get the right texture. Please help I would like to keep baking and I need to make my daughter's birthday cake soon. Thanks for any help that can be given.