Food will cost money in the world of Yakuza Kiwami 2 so you will first need to establish a source of income. This is easy to do once you have unlocked the Cabaret club in Yakuza Kiwami 2. This will let you earn money easily by managing the club and leveling it up so you can get more hosts. Since you will be competing in a national event for this mini-game, it also works as a goo side-activity to spend some time in case you want to grind for better upgrades.
Once you have established a source of income, make sure to invest in these 3 skills that are essential to getting the most amount of experience points.
- Boost EXP Gain: 5 Levels
- Boost Hunger Gauge: 3 Levels
- Boost Digestion: 3 Levels
Make sure to spend your earlier experience points in these skills so you are ready to start farming more of them for some of the more demanding ones.
There is an item called AppStim RX that will let you eat more food so make sure that you also have a good stock of them as you go running around trying almost every food joint in the world of Yakuza Kiwami 2. It is best to squeeze out as much food as you can so pick out the large requirement ones first and the settle on ones that will fill out the rest of the hunger gauge.
You also get experience points by clearing the substories, main story events or mini-games, but the best way is always going to be the food. It is easier and quicker to do so while clearing out any gangs that you discover in the middle of each food joint.