You can consult an ENT surgeon. Sore throat can be due to pharyngitis, laryngitis, tonsillitis, reflux disease etc..So only gargling won't help in subsiding the inflammation. Also if infection is present, then antibiotics are recommended. If any travel history, or contact with a person who has had COVID, precaution need to be taken.
Next Steps
consult with an ENT specialist for detailed history. Once the diagnosis is made, then treatment in the for of medication can be started.