You could try to help it heal and support the Plant. It's hard to tell from the pic how long the stem has been broken which could be a factor weather or not it has dried out where the break is which will prevent the stem from healing. If the break is new and or is a partial break and the stem is still partially connected, gently realign the broken parts and provide support. If realignment is not possible cut the upper stem from the plant.
Of the stem can be matched at the break use gardening tape, duct tape, pop cycle sticks as splints to hold the stem in place. A long bamboo pole inserted in the soil aligned to the top of the plant and secured with tape , string. Make sure the support is secure but not too tight to avoid further damage and tight enough to hold the stem in direct line with the break.
It takes months to heal and loss of the upper leaves is normal . Once the stem is secure remove 30% of the upper leaves so the plant can save energy to heal at the stem line of the break rather than support the upper leaf growth. This process can take indirect light and carefully check the stem/plant daily.
If this does not show signs of healing in a few days in order to save the upper stem cut at break with an even cut . Remove the top section place the cut stem in water it will grow new roots in a few weeks. Then plant in a new pot or if enough room in pot where the old stem is add the rooted stem back in the same pot. The main stem left in the pot will also grow new leafs in time too.
Remember in order for the stem to root remove 50-60% of the leaves so the plant will send energy to grow new roots . Some of the upper leaves will die anyway. I usually cut the leaves in half that were left after removing 50% of the upper leaves.
I have done the above techniques many times as some of my Dracaena's or common name Corn Plants are well over 20 years old and propagated them several times from cuttings.
If a tall full leafy plant is desired then purchase a new plant. It will take years for the existing plant stem and cutting to grow to the large size of the original plant.
There are many examples of this technique on youtube.
Picture below is a stem cutting growing roots in water ready to plant in soil.