If we calculate there is a profit of 20% (after deducting the exchange fee) which calculating to 5k€ is 1k€ profit!
Yes putting that large amount of money into a single investment is not a wise decision. Better split up the money for different investment.
Just pick at least three you think will be profitable and after that you will gonna decide how much money will you put on each of your chosen investments .
It is also nice to split them apart equally but I'd suggest that the higher the chance that you think an investment is profitable then the capital must also be.
If I were you I'd go with 50% For bitcoin keeping, 30% gambling site, 20% altcoin