Buy 5 coins for 1000EUR each => wait till each of them grows 10% => sell.
If it went down, I still wait until it will go back up +10%. It's ok if it will take weeks.
That's called a long-term investment strategy, it doesn't matter if you do that, many people do things like the strategy you call it.
If you can add 5 more coins, to 10, the important thing is you have to look at the potential coins in the market, which have the best volume and trade in the market, for what do you buy coins that are less desirable by the public in the market just to drown your money, look for good coins in the market for investment.
what kind of coins are you currently investing in.
And my idea is you should also have short-term trading to get more profit, do two things long and short term investment.