Well yes it is more profitable to invest in the alt coins of value less than a dollar , because you can hold many of them and even if they touch a dollar milestone than you would earn a huge profit instead of keeping a big coin well eth also had a good profit nowadays as it suddenly increased to 1400$ from 600% means profit more than 50% well you just hodl what you can avail in good amount whether it is eth or some alt coin which is below dollar
I will suggest you dont think about buying low price Altcoin. You will have to wait for a long time to earn some money, while Ethereum is the second biggest crypto in the world and it will give you more profit in less time. So keep your 1 ETH in your wallet and wait for some more time. In the future the price will grow more and 1 ETH will be enough for your huge profit. If you sell it you may not be able to buy it again.