Hello there. Do not panic just yet, as forty-eight hours is still a window where things can be turned around safely.
First, check your ambient room temperature. Yeast can stall if it drops below twenty degrees Celsius. Move your container to a warmer spot.
Second, discount sugar is fine, but garden fruit can sometimes lack natural nutrients or have wild yeasts competing. You can make a simple yeast starter by taking a small cup of your must, warming it slightly, adding a pinch of fresh yeast and a tiny bit of sugar to activate it, and then pitching it back once it foams.
Finally, ensure the vessel is loosely covered to let gases escape while keeping contaminants out. Give it another day or two after these adjustments.