your start button on the right handlebar requires service.
When this button is pressed it does 2 things. It removes power from all non essential circuits (lights, radio etc) and engages the starter.
If the button get dirty, which it does, then power is cut off to the bike. Turning the key off and repeatedly pressing the button will likely get you moving but disassembly and cleaning is required.
It can also be a sticky relay in the same system.
Also, I suspect the little "gate" at the ignition key slot has disintegrated and you've got bits of plastic, and possibly springs, down in the lock mechanism. The flushing with lubricant may have washed them temporarily out of the way, but they may work their way back into a position such that the key won't insert all the way or turn easily (if at all.)
Best to get some dental picks and compressed air and try and fish the little buggers out. As a last resort, you can remove the ignition switch for better access. It takes a T30 torx bit to remove the switch (under the chrome cover.)