Paper mario will be just fine and they are doing an effort to bring back the franchise to what made it special with the 2 first titles. And that effort will be rewarded cause there is a lot of hype to it and a pretty dusty schedule for the Switch atm so i see a lot of people buying it even if they wouldn't necessarily do it.
For the Switch Yoy growth, the console had little momentum in Jan and Feb 2020 since the last big game that came out was Pokemon in mid November while 2019 had Smash in December. Switch was bound to have a big leap even with just animal crossing but the Covid did help make the game go viral. I think it help bring a bigger audience but looking at social media and amazon it is clear the Switch is still in high demand even 3-4 months after that happened and even with social distancing becoming less of an issue.
I don't think it will keep that growth for each month but i do think it should stay up atleast till september, at that point it will depend on what move they do.







