depends on how equipped you are and how comfortable you feel with taking things apart.
Mines Constantly in bits so I'm used to chasing gremlins and figuring out what is stopping it firing. Usually it's muggins here that's forgot to plug something back in!!!!
Go through the usual list and think of fuel, air and spark. Start off with the easy things that can be done without the tank off like battery , fresh fuel , checking fuel taps n cut off switches, fuses, dodgy alarms etc.
Regardless of how much further you go, probably the easiest thing ever.... Drop the oil and put a new filter on.
If you then decide the tanks coming off, do the plugs, dismantle the carbs and clean them then try it all again.
One question from me, when you try it on the button, does it try to fire, even with a slight bit of throttle, or does it just keep turning ?
If all that fails, find out which one of us lives closest to you and bribe them to come round with offers of tea and biscuits ☕ï¸í ½í±
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It just keeps turning dude.