Yeah the first crypto rule is never invest more than you are willing to loose.
Everyones strategy in crypto is at the end of the day we must free from risk with good profits. In crypto, Higher the risk. Higher the profits.There is nothing wrong with being a long term holder. However, diversification of risky investments, especially when your paper-profit becomes a huge part of your overall portfolio, is wise. After getting profits taking initial investment back is very good idea so there will be zero risk so you can trade only with outside money. 
Some people joining in pump and dump groups and loosing 30-80 percent of money.
Always trading with stop-loss is good idea now some exchanges like binance supporting stop-loss feature.