if ur bike isnt used for such a long time,, then i think u consult a mechanic,, cause ho saktha ha koi special treatement ho aisay case kji,,
and the changing of oil rapidly twice wont help,,
do not try to kick it ithou oil,, try checking the oil oil,, try kicking slowly rather just pushing the kickstart down and leave it come back then do again for few minutes,,if no drag is felt then just try starting it and take it o mechanic,,
it may need to be cleaned inside,,,