Having a trading plan is not just the key to success. Being psychologically prepared is a must in trading any type of asset, not just cryptos. Controlling your emotions is the most important part, and that represents 80 to 90% of your success.
On top of that, having a diversified portfolio is a must. And by diversified I mean really diversified. If all you have is cryptos, there is a huge correlation between all of them. Bitcoin goes up and all of them go up, Bitcoin goes down and all of them do too. My personal suggestion is:
1.- Start small
2.- Use only money you can affort to lose.
3.- Make a trading plan
4.- Read some books about psychology. My suggestion "Trading in the Zone" from Mark Douglas
5.- Learn the fundamentals to choose where to invest.
6.- Practice, practice, and practice and measure your results.
7.- If you can not handle your emotions while trading just BUY and HOLD top 10 cryptos. It is probably smarter right now