Did you do anything else than the oil change?
When you tried to crank it, did the engine rotate at all?
If yes, could be a hydrolock.
If no, {kinda doubtful}, but possibly the starter is hung up?
Try putting the engine in gear and rock the bike. (gently)
Last thought; Did you remove and replace both drain plugs?
If so, was one longer than the other? (Not probable, but it happened to me once)
{Occasionally, some owners replace the plugs and a past owner might have installed 1 that is too long}
If one was longer, there is a slight possibility that it is too long and you put it in the wrong location.
Ride safe, Ted