I Would launch a new DigitalMonster V-pet project.
The device would be a color screen device with Vital Bracelet sprites and it would have many of the features similar to the modern tamagotchi series.
Like events based on specific days of the year , a money system, Food that effects the Digimon in different ways, different locations to explore on a map, and events that take place specifically during the night and day.
It would also have a training system like the ones found on Digimon world and DigitalMonster Ver s. where you can train different stats ( attack, speed, intelligence ect, based on what training you do.
Plus the device would have a happiness and discipline bar.
The battles would have a strategic battle system based on commands and stats then
Lastly, It would have a lithium rechargeable battery, and connect via Bluetooth to battle other devices and connect to an app where you could live battle other tamers online.