At least you are getting somewhere. It could be the relay.
I hope guess you have checked;
The engine run button was set to on.
The clutch was pulled in (not sure if it applies to this model but some bikes need the clutch in and in neutral to start them)
You should, with the ignition off, undo the starter motor +ve connector, Put a tester to this and earth, turn on the ignition and push the starter. If you get a voltage reading then it could be the starter or starter isn't earthed. If you get nothing then it is further up the chain between the starter and the battery, check the smaller fuses also as there could be one for the starter as well as the main fuse.
You could also run a thick wire from the battery +ve to the starter +ve terminal to see if it spins.Wires can get hot, melt and burn. I would do this with a jump lead.
Only do these tests if you are confident you know what you are doing. and touching anthing from the +ve side to the frame or earth is NOT a good idea.