I think it is not logical to change some coins on one another. There must be diversification, buy more than 5 promising coins. If you leave only one type of cryptocurrency, it is only bitcoin. Bitcoin is the first cryptocurrency.
it's better to continue to hold Bitcoin even though the price is currently declining but the potential is very large to return to the highest price, but it takes time so we have to be patient. Bitcoin is crypto that affects the value of Altcoin so Bitcoin will be the first to experience changes so why choose another.