IMO, you shouldn't be investing in cryptocurrencies or any currencies for that matter. Currencies should be
used, not hoarded with the expectation of gain. If you're buying cryptocurrencies as an investment, you've already lost.
Cryptocurrencies literally cannot function without speculative investment. Even in the absence of formal investors, someone has to be the first person to accept the tokens in exchange for something of value, in hopes that they will have value of their own in the future. Until then, the tokens are unusable.
Further, the market cap and liquidity of a cryptocurrency impose practical limits on what it can be used for. You can't very well conduct a billion dollar transaction through a cryptocurrency that has a market cap in the millions. Investment raises the market cap, "unlocking" these higher-value use cases. Conversely, loss of investor confidence will reduce the market cap, and effectively reduce the utility of the coin.
This is why ability to scale is so important. The current market values of Bitcoin and the various alts are based far more on speculative investment than they are on usage. Those investors believe that the coins will see far more usage (and have far more natural demand) in the future than they do today. If that turns out not to be the case due to an inability to scale, investors will start to flee, and the vicious cycle will start.