I will advice you to first learn from those that have experience in cryptocurrency trading so that they can put you through the rudiments of trading cryptocurrencies so as to avoid such loss in the nearest future. With that you can know which crypto to invest in and the ones you should not invest in. You will also know the amount to invest in any of the cryptos you are investing in. This is what i did before venturing into trading cryptos and it has since being working for me.