Not enough useful info to troubleshoot. Need to show interlock-switches and their states (how did you bypass?). Also show starter, starter-solenoid, starter-circuit-relay as well as start-switch. Having diagram is good start, but it
must match exactly circuits you have on your bike, down to every wire-colour, wire-connector, switch, etc. Show every twisted-together junction, every soldered junction, colour of wires before & after. Once accurate diagram is created, then we can devise tests between various endpoints to troubleshoot.
Please review this thread on troubleshooting no-start condition. There are no short-cuts. Need to measure voltages and ground status at
every junction between battery and starter. Where the voltage disappears is your problem spot.
https://www.ninjette.org/forums/showthread.php?t=318707
At this point, we have no idea if cause of no-start is problem with ground-circuits or power-circuits (could be both, or multiple issues on each for all we know).