300$ is a good start for you to do trading, and I believe that you can double it in one month mate.
But of course, while you're doing it, you should also do some self study about trading in this crypto business
because you're gonna need it here as an individual trader.
100% profit in 30 days is not possible all the time,so don't get this kind of goals to be achieved especially when you start your trading career because you will end of with 100% loss.Keep the things low as much as possible,like 10-15% will be a good target and avoid intra day trading as well when you are in learning phase.
You will not get it if your mindset is always at long trade but if you do leverage trading and know how to stop loss and gain the profit then 100% for is quite reachable, I saw several traders earning that percentage and quietly they are still killing the market eventhough there's a dump happening right now. And for newbies they should learn the basics before going in or maybe they should seek a mentor that can help them for there trade ventures.