One important lesson to learn as far as cryptocurrency goes is that, you can not time the market no matter how skillful you in reading chart and graphs, you can only control your trading and investment entry and exit!
Of course you can't time it correctly you just read the charts and graph. The charts and graphs only speaks of the past. You should keep your self aware of the current events too. These events have a huge influence on the market. Events can trigger the price to go down (an exchange hack) or go up (lets say ETF approval). Also "expectations" can also lead the price to go above or fall.
This is a big problem for many traders, they want to sell at the very top of the market and there are very few people able to do that and most of them are just lucky, it is impossible to predict what is going to be the maximum price of bitcoin but that doesn't matter as long as you sell when the market is going up and we are in the middle of a bull market you will still obtain great profits, it's not important if for example you sold at 15000 when you should have sold at 19000 in the last bull market, you still obtained profits and that is what matters.