There's nothing exact amount recommended in trading if you investing huge amount you can get huge amount of earnings but don't forget the high risk of loses small investment small loses if ever.
I remember that when I started trading, I used to trade with very small amounts and once getting profit I increase my investments. It was just planning so that even if I lose in few trades, my overall money was not lost.
I hope you have some trading experience then because most of the people lose their value in the market when the prices went down. Yes, we have to be very patient in the crypto market in order to make a profit and sometimes it is impossible to predict when the market will go down and when the market will start increasing.
There is no limit for starting crypt trade. You can start from any amount, but it is good to start from small amount because if you have trading experience, you will lose your money. When you realize that crypto trading is good and you can make good profit from trading then you can invest more money in it. By this way you will be mentally relaxed.