1. Use your surplus to buy one of the top 10 Coin and keep it long time
2. If you do not have the knowledge, invest regularly even when Coin prices rise or fall
For example: Buy 100 $ Bitcoin per week, then even from the period of Bitcoin with the highest price of 20K $ until now you still have profit. And keep it for a few years, not sell it
3. Accumulate daily knowledge and learn from old people in this market to be a smart investor yourself