After going through each Comment here, I must say  that I've learn a lot. Well informed. Now I don't have to be worried about any coins I will like to invest in.

I for myself have already decided as soon as the market goes into growth I will exchange the unpromising altcoyins that lie in my portfolio on the EOS. During the dump, I'll take a wait-and-see attitude.

I think the best strategy is to forget to buy bitcoin and cryptocurrency.
Because no matter how fast it falls, both bitcoin and cryptocurrency will rise again, and there is no need to worry.