There's no ideal fix amount on starting crypto investments as long as you're willing to throw your hard earned money and invest on the altcoins you love then you'll be fine.
even $10 will do and the more you invest the more you gain profits just like gambling.
Investing Crypto is the most profitable this year while the crypto market is dropping and me myself in investing on some of my favorite altcoins like Oyster Pearl PRL, WePower and Envion.
Investing altcoins this season will offer higher return of investments because they're all cheap especially top altcoins like Etheruem, Ripple, NEO, Monero and other promising top altcoins in the market.