That's why you should divide your investment according with markets 24h cap and price value.
One reason people should not take advice from forums and blogs
Trading based on market cap and volume in crypto is the bulletproof way to lose your money in a matter of days.
The simple quicker answer is YES, of course.
The complete one is: I can use a portfolio of multiple investment cryptocurrencies so that when price changes on specific alts i can switch to others and trade immediatly.
You don't understand what diversification means.
It means investing in stuff that is either unrelated so it won't take a hit, like cocoa futures and BMW shares or totally opposite so in case one of them fails the other one will probably rise in value.
What you're doing is basically spreading your money in 300 shitcoins which will all go down if bitcoins sneezes. Your diversification is not helping you stay with no worries even for a week, a coin going down is not being compensated by another going up and if something bad happens to the crypto scene they all go down!