Investing in only one currency is risky. Especially if it's not bitcoin. The fact is that the cryptocurrency industry can hardly be called reliable so far, and any altcoin can easily fall by 200-300% or even simply disappear. It is not worth composing your digital portfolio from one bitcoin, or even less another cryptocurrency. It is necessary to diversify your investments.
Even if Bitcoin does not collapse, it may simply stop at the current mark of 10 thousand dollars. Then investing in it will not bring any profit. That's why you need to fill the portfolio with other promising digital currencies. It is clear that if cryptocurrencies from the top 10 by capitalization are included in the portfolio, then doubling of investments can be expected for a very long time.
Bitcoin, Ethereum and XRP can stagnate in one place for ages without any profit. An ordinary portfolio with relatively low risk consists of 70% of the top 10 coins and another 30% of the top 30 coins. Such a portfolio can double for many years. That's why it is more profitable to compose a portfolio in other proportions, adding cryptocurrencies from the top 100 to it. A portfolio consisting of only a quarter of top-10 tokens, 50% of top-30 tokens, and another quarter of top-100 tokens can be considered risky. Such proportions are most often used by experienced investors to get profit in a relatively short time.
Tokens of potentially successful ICOs can also be added to the portfolio. The latter can grow by 1000% in a short time. Of course, it is very difficult to guess which ICO project will grow and which one will fail. It is interesting to use the following trick: add half the cryptocurrencies that usually grow with BTC to the portfolio, and fill the rest with cryptocurrencies that usually fall with the growth of bitcoin. Such a portfolio is well suited for saving funds, but it is unlikely to yield significant profits.