my piano is too small, i want to play my heart will go on but.....?

i can't cuz i have 61 (not sure) keys, and you need more than that, so
what i do is change the octave up and down but at one point i can't do
that 61 keys it's just too small! ughhh! i can't finish the whole
song! and i can't buy a new piano cuz it's too expensive, what shall i
do!?