It depends upon when you receive the last second shot of Pfizer vaccine. If you received it more than nine months ago then you might be eligible for a booster shot.
If you are in India there is no evidence on efficacy of giving booster of Covi shield after Pfizer vaccine
Next Steps
Follow the govt guideline for vaccination. .
Health Tips
Follow COvId appropriate behaviour that will help. Two shots of any vaccine continue to provide protection against severe disease.