You need to monitor the market very well before you invest in crypto, that is one of the important thing you have know about crypto, invest when the price is low, and when you invest within that period, if the price of Bitcoin increases you will make a profit from bitcoin investment, that's what I want us to understand, the reasons why some people get lost in their crypto investment is that most the investors always concentrate to by Bitcoin when the price is high, from the my best of knowledge through your panicking because of the price of Bitcoin that goes down, the thing is that bitcoin price can go up, and it can go down at any point, so if you wants to make a profit invest and remove your mind for the investment at that time especially when the price is falling, because bitcoin have never experienced falling for two years
Your advice on Bitcoin to @OP is very good. Watching market closely and buying when prices are low is key just like with any investment. You are right that selling in panic when prices drop is big mistake as Bitcoin naturally goes up and down. Waiting it out mostly means you will gain when prices recover. It is also true that Bitcoin has historically shown strong recovery never staying down for two years which really highlights why patience and long term view are better than trying to perfectly time market.