being greedy isn't good especially doing trading 'cause you will end up to regrets and losing money, so first thing first if you want to earn profits, learn first to control your emotions before jumping into it and to avoid loses and etc 'cause that's the common reason why people always panic when there's a fluctuation in the market.
Anyone who is greedy while trading will most of the time always would not know when to be selling and usually do not always have a plan and a strategy, What makes professional traders is not by trying to get the best value to sell, it is by having a plan and sticking to it, irrespective of what the market eventually gives. Yes, as much as one may have strategy to buy, it is always necessary to know what to look out for to sell in a market depending on one's trading pattern.
always set reachable target price and a reasonable target loss. Always follow that target. It does not matter if the coin continue to rise because sometimes waiting for a higher price is deadly. Sometimes instead of going up it will goes down.
There is always some basic level of support and resistance in every market and it is always important to take note of them most of the time which for anyone who is smart enough, they will know when to be out of a market and when they should still be in the market, but as long as you are making very good profit already, it is necessary to always play safe.