The oven was not reaching the desired temperature

If the bottom heating element is not glowing red when you turn the oven on replacing this part may be the answer. Look for a spot on the old element that could indicate it has shorted out and no longer carries a charge.
Very simple to remove the two screws holding the element in place, pull the element out about 3 inches, disconnect the two wires, replace with the new element and reattach the two screws. Simple and effective. The new element is fast and responsive. Do this before any other suggestions to replace more complicated parts in the thermostate etc.