Hi Ravi
IRCC is backlogging all visitor visa applications until September 2021 with the new travel restrictions. So when you apply for a visitor visa they are unaware of the application urgency you might have. At present they are only processing applications for people who are exempt from travelling to Canada which includes people on study permit and work permit. You need to inform them about your application if you've already applied or apply in a certain way if you haven't applied yet
Here's the link that explains how to apply and what to do if you've already applied for a visitor visa :
https://www.canada.ca/en/immigration-refugees-citizenship/services/coronavirus-covid19/visitors/visa.html
My urgency to travel back home was due to a medical emergency and I need to travel back to Canada as I am currently employed here and will need a visitor visa to enter Canada. However if you do not have a medical emergency you are still exempt from the travel restrictions as you are either a foreign worker or a student.
So to convince them you need to show the documents that prove you normally live in Canada (for eg: currently employed letter , recent pay stubs , latest credit card bills , lease documents , etc)
There is a format you need to follow and email them which is in the link I have provided and even the email address is in that link itself
I would advice that you go through that link thoroughly and send one email telling them that you are exempt from the travel restrictions
I hope this helps and feel free to reach out to me