Mastering Payday 3: Level up fast, unlock vaults, and dominate with max skill points

To level up quickly in Payday 3 and earn Infamy Points, players can complete challenges in the Career, Combat, and Heist categories. Grinding Combat and Heist challenges is recommended for fast XP gain. The max level in Payday 3 is 150, with all weapons and skill upgrades unlocked by level 100. Certain heists like Dirty Ice, Road Rage, No Rest for the Wicked, Rock the Cradle, and 99 Boxes are recommended for XP farming. Completing heists in stealth does not grant bonus XP, but it does provide bonus weapon XP. If not receiving any XP, it may be due to a bug and restarting the game is suggested.