Chances of getting admitted to USA universities for Fall 2021
This is going to depend on your field, and the schools that you apply to and what their individual situation is, among other factors.  As someone in the US, that's also not to say that things won't be competitive in Canada or Europe either, as there are Canadian universities, as well as possibly European universities, that are just as reputed as some of the top universities in the US (at least as far as what I know in my field), so it's a flawed assumption, at best, to assume you'll be admitted to a program if you apply to Canadian/European universities.
The only advice I can give would be to contact the programs you are interested in and ask what their situation would be for the upcoming admissions cycle and if you're better off applying in a future cycle.  What I will say is that graduate admissions is generally competitive and a crapshoot no matter what the timing is.  Therefore, if you want to apply to US universities, and see where you get lucky/hope for the best, since the worst they can do is say no.