Good point made by @Dark_Night - PRz going back to their native land will keep wondering about Canada morning and night. Survival jobs is a way out. I am also looking for them, unfortunately, walking in stores and handing out my CV like a promotion pamphlet would have worked really well pre-covid as college students used do that only... to get 14 dollars per hour jobs like this only...Have you already booked your tickets back to your home country? Don't give up so soon man, things will eventually get back to normal. In the meantime, if you don't have enough funds, you could get a frontline job? That way you would meet new people and maybe you'll have luck finding a better job? W.r.t. the SIN, if you have a CORP and passport you can open a non-interest bearing account without a SIN - once you have that, you can submit your SIN proof of address. I know things are less than ideal right now, but you've come this far, and going back might be an easy way out, but it might not be the best longer-term.
Please share how your job hunting experiences are going... are you physically handing out your CV's or applying via networking sites...
How effective is facebook & instagram in looking for jobs?