Clean all your grounds on frame and engine
clean wire ends on battery both negative and positive
replace the spark plug if you haven't in a while/what does it look like?
check starter relay, which may have to be replaced.
the silicone rectifier by the headlights may have to be replaced, wires colours are 2 light-green/red wires go to it.
make sure all the fuses are good and tight
and of course check the Neutral switch itself, unplug the wire from it. get an ohmmeter and connect one lead to the N switch and the other lead anywhere on the engine, does it beep or is there continuity while in N? does continuity or beep go away when you shift in other gears?
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