If you want the Z to home to where the nozzle is close to the bed, then you had it correct the other way, with Z_HOME_DIR set to -1. This is USUALLY the way that these printers home.
If you want it to home as far away from the bed as it gets, then you need to have a limit switch attached at that point.
More likely what you want to do is find the
#define INVERT_Z_DIR false
line in your configuration.h and change it, so that the motor turns in the direction that you need in order to move in the expected direction.
MBot3D Printer
MakerBot clone Kit from Amazon
Added heated bed.
Leadscrew self-built printer (in progress)
Duet Wifi, Precision Piezo parts