I prefer crypto margin trading with leverage 10/20;
1.Positions should not contain more than 1/5 of your trading equity --> avoiding complete loss of whole equity in case of liquidation
2.MOST IMPORTANT: No FOMO, No FUD --> You have to take every profit thats possible,  I prefer 5%, its enough really; you can trade up to 50 positions in a hour
3.Dont forget its a matter of Luck, too. If the price level raises a bit, you can't work anymore with the open short position for example. You have to spontaneous create a plan, or stay with your routine plan, how to handle the endangered position. --> in that time you can open another 1/5 of your equity.

I realized about 2200€ with 250€ within 3 days, after that a mixture of FOMO and FUD ripped my hard worked money of my poor student hands:D

Either "the bubble will burst" or BTC will grow above 20k;
 I read that several big players, like Soros invested in the last dip(maybe rumors don't know);
But it seems like BTC is growing again and if you just compare the former burst bubbles, you will see that there was muuuuuuuch more Volume and were more Investments;
Another point is the fact that BTC could become a cash equivalent, in this case the Volume should be not less than 50 Trillion.