Decongestant nasal drops can paradoxically cause more obstruction. You will have to stop it to get long term relief. Since you have undergone surgery also,, direct examination is important before we start treating. Most likely it looks like allergy and you will need prolonged treatment - for a few months.
Next Steps
Since it's a lockdown, if you're unable to personally visit an ENT surgeon, you can take anti allergic medicines like, say, Tab. Xyzal 0-0-1 for a week. You can continue steam inhalation also.
As soon as possible, visit an ENT surgeon in your city
Health Tips
Masturbation or eating fruits will not cause cold.