You calculated the energy required to change solid gallium at $\pu{20.0 ^\circ C}$ to solid gallium at $\pu{29.76 ^\circ C}$.  Once solid gallium reaches $\pu{29.76 ^\circ C}$, additional energy is required to melt it.  The energy required is given by the $\Delta H_{\text{fusion}}$.  So to complete the question, transform the $\Delta H$ units to a grams basis instead of a mole basis, multiply it by the weight of gallium in the problem, and then add that result to the one you already calculated.  That will be the energy required to change solid gallium at $\pu{20.0 ^\circ C}$ to _liquid_ gallium at $\pu{29.76 ^\circ C}$.