My 2008 ZZR600 sat for over 2 years, and when I turned the key nothing happened, even with a new battery added.
I put it in first gear and pushed the bike forwards and backwards with the clutch lever out, until the back tire was skidding on the floor. It worked- the starter began turning the engine.
Then I had to deal with old improperly stabilized fuel in the gas tank after the engine started, after several seconds of cranking.
At least you learned quickly and cheaply which mechanic to not trust.
“Banking institutions have banished precious metals and substituted a more fluctuating and unsafe medium; they have withdrawn capital from useful improvements and employments to nourish idleness for the few, who prefer demoralizing pursuits to labors useful to the whole; the peace of the whole is endangered by evils more easily to be deplored than remedied." by Thomas Jefferson,1810 (edited)