if you still hold BTC now, then you just have to keep it up until the crypto market is soaring high because if you trade it for another altcoin then you should choose a coin that is better than BTC.
maybe he has other BTC in His position thats why he is seeking for diversification But never consider single coin.
EThereum,Binance and Litecoin can be a great choice for now.
maybe ethereum and BNB can be the next choice. when you only have 0.2 bitcoin, maybe you can divide it into 0.1 fixed on bitcoin, 0.05 for ethereum, and 0.05 for BNB. it's probably better than having 1 crypto. but, bitcoin alone is good enough in this regard.