Usually after root canal, most of the time it is must to have cap done as the tooth is not as strong as the natural tooth.
In your case it looks like your tooth might have got fractured. You can visit Dentist to check the extent of fracture and if the tooth can still be restored. They might take a radiograph to check fracture.
In case it cannot be saved, get it removed and replace it soon. Do not delay replacement of missing tooth as it has deleterious effect on the surrounding teeth
Next Steps
visit your Dentist asap
Health Tips
avoid eating anything from the fractured tooth side
all the best