Job 1
Why not have a pseudo Paper Jam 2, I say pseudo cause it's less focused on Paper Mario and more like Mario as a whole. It's basically the Sonic Generations of Mario, travel across time and space in the Mario series. The gameplay can be separated into several campaigns featuring various iconic Mario characters. The main Mario and Luigi campaign features Mario, Luigi, and their paper counterparts go on a journey to find a magical fountain or something to fix all the dimensions from colliding into each other. Aside from Bros, Trio, and Quad attacks you could also have Summon attacks which feature summoning a famous Mario character to assist then. Bowser Jr and his Paper equivalent could create tactical rpg battles featuring all the partners from both the main and rpg Mario series so you can have the likes of Cappy, Fludd, Goombella, and Vivian in the same team. You could even have a fee reformed villains like the Bleck Trio and Poppy and even characters from other franchises like Cranky Kong, all with the goal of stopping someone from breaking the elemental seals or something. This isn't like Bowser Jr's journey and is instead more like a Fire Emblem tactical rpg, minus the permadeath. For a more tradtional Bowser's Minions style campaign Wario could make his Mario and Luigi debut and "buy" properties in an attempt to make his own kingdom, and by buy I mean shake people down with his hired goons, all the while discovering a conspiracy that could shatter the Mushroom Kingdom. This may sound complicated but I feel like a game like this should celebrate the greater Mario franchise.