Should I opt for an implant if apicoectomy with bioceramic root sealer failed? (Photo)

You should feel better with apico after one week.  If within two to three weeks its not better, then most likely extraction and bone graft is in order.  In four months you should be able to receive the implant in that area.  The X-ray that you have uploaded is of the upper front tooth and not #21.  

Hi there! Sorry for what you're going through. Wait another week or 2 to see if your symptoms resolve.  If not, then it may be best to have the tooth extracted and have an implant placed.  Implants are great restorations and are a great way to replace missing teeth!

wait for 7 to 10 more days. pain is still there means , infected root. in that case, remove and plan implant . 

Hello, 
I am sorry you have been going through such a difficult time in regards to # 21. I would recommend opting for a implant if a second attempt at an apicoectomy is necessary. Implants are the standard of care. Please make sure you see a oral surgeon or periodontist to evaluate and place the implant. Good luck.
Dr. Vahid