Theoretically, I would say any amount of bet is never enough to say whether you are ready to hit that 50-60% winning spot because the result relies on a particular day.
But practically, if you are hitting that range even after 400 bets then you are already a pro, and over time you will learn new things and it will help to evolve your betting strategies. But just as someone who simply wants to enjoy sports betting irrespective of having the intention of becoming a pro sports bettor just the odds and results decide my winning which I consider as my fate or destiny.