So basically very few people can come to US? Or is it the returning part that is the problem?
The bringing in of workers is the problem.
I am not sure if you have been following the news but Trump admin has suspended most work visa processing for all of 2020. The visas most relevant to you i.e. H1B and H2 are suspended for further processing.
Secondly, Canadian PRs do not get any preferential access to the US. Canadian citizens can work in US on TN visa.
In short, 2020 is not a good time for you to apply for a work permit of a worker who is a foreigner.