Why does my tablet keeps on loading for 2 days till now?

Hi, my tablet keeps on saying that there is insufficient space whenever i try to download something from the play store. so i decided to erase everything and rest it to the factory version. after all of that, it still wont allow me to download and it keeps on saying the same thing, so i decided to reboot it and its been loading for 2 days in a row and i cant do anything now, so i wonder if there is something i could do to stop whatever its doing.