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The dose of Cetirizine is fine and you can give it for two days more and see. If there is no improvement then kindly do a physical examination.
Nasoclear nasal spray can be easily used in form of spray be inserting the tip into the nostril and pressing it. The child can be taught to do himself.
Giving plain steam can be an alternate option.
Calpol (Paracetamol) can be given if there is throat pain or fever. Ibugesic plus (Ibuprofen and Paracetamol) syrup can be used for high fever. Salt water gargling will help with throat pain. Consult your specialist doctor, discuss with him or her and with their consent take the above medicines.
Fresh fruit juices which are at room temperature can be given any time.
Giving curd depends if that triggers cold in him when given.
It is better to avoid flu vaccination for now. You can plan it after one week.
This time of the year is fine to take flu vaccination. Generally, it is recommended to take in in the latter months of the year. There have been major outbreaks even during summer. Hence it is better to protect your child.
For more information consult a paediatrician online --> https://www.icliniq.com/ask-a-doctor-online/paediatrician