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Welcome to the Forum!
Considering most of the USA is in almost a deep freeze, there are a few things you could check:
oil: is the oil too viscous? read the oil thread for guidance. is the oil overfull? either of these will slow cranking speed, which reduces the "ignition charge cycle"
carb: have you changed the idle / pilot jet for cold weather? IOW, increased its size to deliver more fuel during this cold weather. a jet that is cleaned with spray may not be clean enough to flow properly. use a jet cleaning tool that gets the jet completely clean.
cranking: have an adequate "gel battery" that supplies power to spin the starter better than a lead acid design. this aids in the aforementioned "ignition charge cycle". Kick starting a scooter is just too slow and random, it is best using the electric starter. a kick starter IMO is like a spare tire, only used as a last resort
temperature: you will find a thread on cold weather starting, and there is an excellent discussion which you should read.
ignition: tightening the gap from specification a little on your plug could help, but i would only do this as a last resort and only during cold weather
additives: the only additive I have found that offers any help on these 4 stroke scooters is Lucas Top Engine Oil, and it really does work, but only add in the correct ratio - too much or too little is just as bad as none
fuel: regular grade, 87 octane, starts better in cold weather. also fuel goes stale if not used regularly
miscellaneous: use a cover over your scooter if it sits outside, and try to start it daily. Even not starting for 1 day can increase starting difficulty. it needs to run long enough for the engine temp to stabilize, about 30 minutes in temps below 40F
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