$100 amount for trading is not a bad amount for the starter when it comes to cryptocurrency as you can earn more than that if you choose the right coin to ride, the problem is that the market is not stagnant as you think, that amount may not be profitable, you can lose that amount even in bitcoin for a short amount of time, use that for your experience and knowledge on trading then if you are confident and skilled enough to go for day trading then go for a large amount of money to trade, you can't tell exactly what coins/tokens would be pump on that day you need to observe the movement of the prices every second or you can count on the speculations of the experts.