as the title suggests, add more maps to TTT ad restore the removed maps, and maybe while you're at it add more Detective and Traitor weapons from the workshop
https://steamcommunity.com/sharedfiles/filedetails/?id=505696414&searchtext=+payday+2 https://steamcommunity.com/sharedfiles/filedetails/?id=1396527981&searchtext=+payday+ https://steamcommunity.com/sharedfiles/filedetails/?id=2525999515&searchtext=+payday+ https://steamcommunity.com/sharedfiles/filedetails/?id=1802391048&searchtext=+payday+
