Read this post and its true how small investor are losing bitcoin by investing in other coins.
You can buy 8000 tokens in 1 USD when price of bitcoin is 8000 USD but if bitcoin price will rise to 16000 USD then you can buy 16000 tokens in same price. Now all token price does not move according to BTC price,it will drop 20-30% without any sign of drop, but when you will compare with bitcoin you will find that you are in loss.
https://cryptomaa.com/btc/how-small-investors-are-losing-bitcoin-by-investing-in-altcoins/no one going to change all btc to an altcoin . a pro will manage assets.and its also depends on the coin we can also see some coins witch profit more than bitcoin , bitcoin is safe to keep for me.also i have 2 seperate assest for crypto :1.trade 2.long term(just btc)