I did not think that different coins have a different percentage of price drop. I do not keep such accurate records of my assets. Also, the fall may be in relation to dollars, Bitcoins or Ethereum. And if in dollars the price can fall, then in relation to ETH it can increase on the contrary. Therefore, all this is relative.
The main thing that your investment in Cryptocoin does not fall in price.
Get yourself at least a Google table to keep track of the coins you buy, where you could record purchase prices and other information. This is necessary for competent accounting.
I don't have many coins. Yes, and I fix all my transactions on paper. For me, these entries are enough. I am not used to checking courses every day and comparing with the table. I make a long-term investment.
You make records by the grandfather method. There are many programs and computer solutions to simplify the task of fixing data about your coins and tokens.