Yeah, that could works, do you mind to share what are those 5 coins?  Are the coins btc, eth, ada, xrp, and xlm?
10% isn't a relatively high number, if you buy €1000 each, then it's €100 profits for each coin, and the 5 coins I mentioned above could increase more than 10% within a few weeks. Just make sure to set the buy and sell arrangement.