Although you are no supposed to do a soft landing they have been permitted at most land borders. You just ask to go back to the US as soon as you land. It would be much lower risk for Canada for you to not enter Canada for a few days and just return to the US right away. You will still need proof of a negative PCR test. Do you want to enter Canada for multiple days or not. Are you vaccinated with Moderna, Pfizer, J&J or AZ?