Check with a local mortgage company and inquire about refinancing your ALHFA loan into an investment property loan. If you have enough equity in it and income to support the investment loan plus a new home loan, this might work out.

If you do not qualify for refinancing, your alternatives are to sell your present home at some price before making a purchase offer on another home, or walking away and defaulting on your current mortgage, which will result in foreclosure and pretty much destroy your credit. This will make it pretty much impossible to get another home mortgage to buy the larger home you want. Sometimes a foreclosure is unavoidable, but if you can make do with your current home until you get more paid off on the mortgage your credit will actually be stronger and you will be in a better position to upgrade to a larger home at some point in the future.

Best wishes in working things out!