I have not seen your Xray..Depending on the condition of root canal and infection.. two possibilities are there.. Re- Root canal treatment ( Re- RCT) and Extraction is the last option.
Re-RCT is not an option if ur previous RCT procedure has created obstructions inside the tooth. This will be known only after starting the Re-RCT procedure .
Next Steps
Take an XRay of the tooth and ask ur doctor about the possibility of Re- RCT
Health Tips
Nothing to worry.. it's essentially painless procedure as ur tooth has no nerve supply after the RCT procedure done before.