I’m confused as to what your goals are, from what I recall you didn’t want a big bike and were buying this because its what you wanted, not as a stepping stone to a super sport.
If all you need is to become “proficient”, whatever that may mean then then 300 can be for sale in 3 weeks once you are “proficient” in how to operate and turn a bike.
If your goal is to go fast, you’re buying a wrong bike. If your goal is to look cool, you’re buying the wrong bike, if your goal is to be safe as you move on to a supersport, you’re getting into the wrong sport.
But what do I know?