Go back to the basics. Is the engine turning over? If no, start there. Kill switch working? Does it turn over with the bike in neutral, kickstand down? Kickstand up? In gear with kickstand up and clutch pulled?
If yes, are you getting fuel? is the fuel pump priming when the key is turned to on? Is the headlight working (if the headlight circuit isn't working and/or you don't have a fuse for the headlight, it won't let you start the bike)? Is the fuel rail building pressure? Do the injectors cycle? If no, troubleshoot the fuel system.
If yes, are you getting spark to all 4 cylinders? Are the coils working, property connected? Is the battery properly wired? Grounded? Do you have a short somewhere? Is the ecu getting full power with key on? with engine cranking? Does the battery have good voltage when cranking? Etc.
Hope this helps.